The following tables present IEM computed monthly data summaries based on
daily data provided by or computed for the IEM. A download interface
exists for the daily summary information. The climatology is provided by the
nearest NCEI climate station (USW00014918) within the current 1991-2020
dataset.
To load shown data into Microsoft Excel,
highlight the table information with your mouse and then copy/paste into Excel.
Precipitation Totals [inch]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1948
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.62
0.46
0.29
0.57
0.43
1949
0.24
0.31
0.31
0.21
1.24
0.91
2.27
0.45
0.38
1.46
0.44
0.39
1950
0.42
0.09
0.57
0.64
2.34
2.80
1.22
1.10
0.66
0.45
0.56
0.33
1951
0.16
0.51
1.19
0.58
0.15
2.06
1.04
2.16
0.85
0.65
0.35
0.37
1952
0.17
0.08
0.28
0.19
0.11
1.62
1.57
0.39
0.04
0.23
0.33
0.12
1953
0.67
0.23
0.49
0.33
1.69
1.14
1.03
0.95
0.83
0.22
0.42
0.46
1954
0.57
0.42
0.25
0.36
0.81
1.23
1.27
0.73
1.24
0.31
0.51
0.05
1955
0.30
0.61
0.34
0.60
0.96
2.54
1.66
0.93
1.86
0.63
2.27
0.99
1956
1.12
0.58
0.89
2.01
2.52
1.37
3.56
0.96
1.73
1.63
0.69
1.26
1957
0.62
0.55
2.08
2.78
0.81
5.92
4.33
1.99
3.47
1.75
2.09
0.37
1958
0.88
0.34
0.29
0.40
1.45
2.56
5.01
1.70
2.12
0.67
2.82
0.90
1959
0.56
0.41
0.42
0.39
4.48
1.66
3.59
5.12
2.69
2.09
1.20
0.93
1960
0.57
0.33
0.40
2.03
1.84
2.55
3.03
2.52
1.88
1.88
1.41
1.66
1961
0.47
0.85
0.68
2.39
1.74
0.72
4.90
2.76
7.36
0.89
0.97
0.93
1962
0.94
1.27
0.76
1.80
5.89
3.45
6.61
2.62
3.57
0.23
0.49
1.01
1963
0.22
1.04
0.59
2.91
4.71
2.08
4.99
3.14
2.52
0.34
1.12
1.19
1964
0.74
0.63
0.65
2.91
2.13
7.39
1.97
4.90
3.32
0.42
0.73
0.84
1965
0.06
0.18
0.49
0.55
0.79
0.63
0.62
0.92
1.97
1.03
0.92
0.61
1966
0.23
0.29
0.95
0.44
0.20
0.68
2.67
0.99
0.43
0.56
0.32
0.33
1967
0.27
0.29
0.43
0.86
0.36
1.10
0.61
0.59
0.79
0.58
0.25
0.48
1968
0.24
0.07
0.47
0.79
0.39
1.67
1.18
0.48
1.73
1.05
0.16
0.49
1969
0.89
0.09
0.05
0.22
0.42
1.11
1.88
0.71
0.46
0.80
0.40
0.33
1970
0.33
0.17
0.38
0.67
1.00
1.14
0.54
0.91
1.17
1.62
0.28
0.32
1971
0.22
0.40
0.20
0.34
0.73
0.57
0.84
1.16
1.48
1.36
0.33
0.15
1972
0.28
0.14
0.22
0.31
1.55
0.46
1.69
0.46
0.67
0.43
0.25
0.27
1973
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1974
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1975
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1976
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1977
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1978
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1979
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1980
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1981
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1982
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1983
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1984
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1985
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1986
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1987
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1988
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1989
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1990
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1991
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1992
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1993
0.68
0.10
0.32
1.67
2.82
2.01
6.03
3.84
2.04
0.73
0.81
0.44
1994
0.46
0.34
0.58
1.47
1.65
4.56
4.02
2.73
3.67
1.97
2.46
0.67
1995
1.04
0.64
0.70
1.20
2.43
2.59
3.29
3.36
3.17
3.28
1.32
1.26
1996
1.78
1.47
0.43
1.56
2.08
4.41
0.00
0.00
0.00
0.00
2.55
1.43
1997
0.61
0.21
1.16
1.48
1.48
2.58
3.17
1.44
3.49
2.34
0.86
0.21
1998
0.67
1.21
0.43
0.67
4.71
4.27
2.18
2.02
0.30
4.23
1.57
0.34
1999
0.11
0.50
2.16
1.81
5.72
3.33
6.22
2.72
5.89
0.65
0.00
0.18
2000
0.12
0.22
0.73
1.46
2.57
4.03
2.75
4.13
2.01
1.21
2.75
0.13
2001
0.18
0.25
0.13
3.55
4.54
3.03
5.29
1.70
2.11
2.59
0.90
0.27
2002
0.07
0.04
0.29
1.48
2.08
8.30
3.82
4.38
1.21
1.08
0.22
0.26
2003
0.00
0.09
0.51
0.65
1.44
4.00
3.34
2.40
2.17
1.03
0.93
0.38
2004
0.65
0.14
0.63
0.90
5.00
1.55
4.37
1.50
6.01
3.98
0.26
1.99
2005
1.22
0.28
0.36
2.32
4.60
3.86
3.46
3.79
1.33
3.20
3.29
0.61
2006
0.90
0.62
2.20
1.16
2.12
2.20
3.15
1.03
1.24
1.19
1.09
1.00
2007
0.32
0.53
1.52
1.64
3.59
4.70
1.62
1.18
4.98
3.21
0.56
1.11
2008
0.21
0.25
0.34
1.78
3.62
4.94
2.95
0.85
4.20
2.39
2.88
1.25
2009
0.88
1.01
3.03
1.06
2.68
1.90
3.63
2.54
1.87
3.19
1.20
1.37
2010
0.83
0.13
0.62
1.24
2.97
2.88
8.61
3.74
6.02
1.22
2.31
1.39
2011
1.57
0.30
0.31
3.59
1.84
4.07
2.15
1.90
1.66
1.84
0.92
0.49
2012
0.87
1.82
2.81
1.64
2.60
2.43
5.50
2.70
0.85
2.84
1.03
1.12
2013
2.19
2.06
23.28
1.87
5.70
1.60
7.40
3.73
2.01
2.07
1.19
1.38
2014
3.17
1.07
1.46
1.53
4.08
10.24
4.58
0.90
3.10
1.16
0.48
0.84
2015
1.32
0.68
0.65
0.72
4.79
3.20
1.47
3.62
1.18
2.88
3.33
1.06
2016
0.59
0.75
2.71
2.09
1.61
6.92
2.43
3.41
3.33
1.48
1.80
2.15
2017
4.88
1.48
0.67
1.58
1.61
3.79
2.25
4.08
3.07
1.59
1.00
1.18
2018
0.71
0.98
0.35
0.34
3.65
4.03
2.58
2.90
3.66
3.52
0.76
0.83
2019
0.67
1.66
0.82
1.58
2.59
1.99
5.56
4.09
6.64
4.90
0.85
1.46
2020
1.21
0.24
0.78
0.86
1.09
2.93
3.37
4.80
1.81
2.70
0.48
1.16
2021
0.69
0.14
0.36
3.50
0.62
1.71
1.35
2.80
3.23
2.77
1.82
1.85
2022
0.95
1.48
1.22
7.61
5.79
4.31
4.73
3.20
2.36
0.71
1.44
1.65
2023
0.26
0.53
1.32
1.90
2.16
2.79
3.18
2.35
3.14
2.86
1.24
1.21
2024
0.67
0.78
1.16
1.38
4.46
M
M
M
M
M
M
M
NCEI Climatology
0.79
0.72
1.02
1.64
3.06
3.78
3.97
2.82
3.00
2.22
1.39
0.99
Average Wind Speed [MPH]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1948
8.5
10.1
9.9
10.9
9.4
8.5
8.8
6.8
7.4
9.1
8.7
9.0
1949
9.3
8.8
9.1
10.3
9.4
8.7
9.0
7.3
9.1
12.1
10.6
10.1
1950
9.8
8.9
9.8
11.0
10.1
9.7
7.7
8.0
8.8
8.9
10.2
8.4
1951
8.6
8.9
9.7
9.7
9.3
7.9
8.1
8.0
8.7
9.2
9.4
8.9
1952
8.6
9.3
7.5
9.0
8.6
9.7
9.2
7.8
9.9
10.7
10.1
8.3
1953
9.2
9.1
10.7
10.8
9.5
9.0
8.5
7.2
9.2
9.3
10.4
10.1
1954
9.3
10.8
10.7
12.8
11.8
9.8
8.1
8.2
9.5
10.1
10.3
8.8
1955
9.0
9.7
10.4
11.9
10.5
9.2
7.8
8.0
11.9
12.1
13.3
11.3
1956
10.8
11.5
12.3
13.3
12.4
10.3
8.9
9.2
11.2
13.8
13.3
12.2
1957
12.2
12.5
11.2
13.7
12.8
11.2
10.1
10.2
11.6
11.4
13.1
10.6
1958
8.4
9.3
6.7
10.9
9.6
8.4
7.6
7.5
9.2
7.8
10.4
7.8
1959
8.0
7.8
8.3
9.3
11.2
8.0
8.9
8.7
10.2
9.2
10.2
9.3
1960
8.5
7.7
8.3
11.1
8.7
9.2
8.4
8.8
7.6
8.1
10.0
8.2
1961
8.6
8.6
9.0
9.7
9.1
8.4
7.3
7.7
9.2
9.2
8.5
9.5
1962
9.9
8.1
8.0
9.5
9.8
7.4
7.7
7.6
7.6
7.6
8.7
9.7
1963
10.1
9.4
9.9
9.7
9.9
7.9
7.5
6.6
7.6
10.6
11.4
10.7
1964
11.9
11.1
11.9
12.1
12.5
10.5
9.0
11.1
11.1
11.3
11.1
9.7
1965
11.1
12.7
10.3
11.3
13.0
11.3
10.9
9.0
9.7
11.4
10.4
11.0
1966
9.9
10.0
12.6
11.4
11.3
10.7
9.6
8.7
8.9
10.8
9.9
9.0
1967
10.8
10.1
12.5
12.9
10.5
9.7
8.4
7.4
8.0
9.5
10.1
10.1
1968
9.6
9.8
10.0
11.4
10.5
9.7
9.6
9.5
9.0
9.9
9.4
9.6
1969
9.9
8.2
9.2
9.4
10.2
9.6
8.4
8.8
9.2
9.6
10.2
8.5
1970
7.9
9.7
8.1
11.1
11.6
9.9
8.9
8.0
9.6
11.7
9.2
9.1
1971
9.1
10.1
9.8
11.4
10.3
6.7
9.9
8.3
9.3
9.9
9.6
9.4
1972
10.9
8.7
8.9
9.6
8.8
8.8
8.1
7.8
10.8
10.4
8.8
9.0
1973
8.1
8.9
9.0
10.2
10.1
9.7
8.4
6.8
8.9
9.4
9.5
8.7
1974
8.4
8.1
9.8
9.8
9.4
9.1
9.1
9.7
9.2
9.2
9.5
8.1
1975
8.8
8.5
10.5
9.6
8.9
7.7
8.1
8.1
8.0
9.2
8.6
7.2
1976
9.2
8.9
10.2
9.0
9.4
9.3
7.1
6.8
7.5
7.5
9.4
8.5
1977
7.6
8.8
9.6
8.4
9.0
7.5
8.3
7.8
7.8
9.3
9.2
8.6
1978
8.2
6.8
7.8
9.4
8.1
9.0
8.4
9.2
9.9
9.9
9.3
8.2
1979
7.1
8.6
10.1
9.6
9.7
8.9
6.7
7.7
8.5
8.5
8.2
8.4
1980
8.5
7.4
8.4
9.1
7.8
9.0
7.4
7.8
9.1
9.2
7.7
8.8
1981
7.4
8.2
8.6
9.7
7.6
8.2
7.1
6.6
8.5
10.1
8.4
7.2
1982
9.4
8.6
10.2
9.3
8.3
8.2
7.4
7.0
8.8
9.0
8.2
9.2
1983
8.9
7.9
9.4
8.8
9.3
8.8
7.6
6.3
8.5
8.4
9.2
8.3
1984
8.6
7.4
8.0
9.3
8.5
8.5
7.4
7.4
8.3
9.8
8.8
8.1
1985
8.9
7.9
10.2
10.8
8.7
8.6
7.5
8.2
9.0
9.9
7.6
9.2
1986
8.9
6.8
9.2
10.1
8.8
8.6
7.5
7.5
8.5
7.9
9.5
8.7
1987
8.1
8.9
9.4
8.8
9.1
8.0
7.4
7.4
6.6
9.0
8.7
7.5
1988
8.3
9.2
10.4
9.0
9.4
7.6
6.9
7.5
8.5
9.0
9.2
8.9
1989
8.8
9.7
8.8
9.3
7.8
7.8
6.3
7.1
8.5
8.1
9.7
8.4
1990
9.4
9.7
10.5
10.5
8.6
8.6
7.4
7.2
7.7
8.4
9.8
9.4
1991
8.9
8.7
9.9
9.7
8.9
8.8
7.8
6.4
9.6
9.6
10.1
9.4
1992
9.1
8.7
8.1
9.6
9.4
8.1
6.6
5.8
8.6
6.7
6.8
8.0
1993
7.8
7.6
7.9
6.4
6.9
7.3
6.4
6.0
9.5
10.1
10.2
8.4
1994
8.4
8.8
10.1
10.6
9.9
8.2
8.7
7.9
7.8
9.5
10.6
8.5
1995
8.8
9.5
10.0
9.6
9.6
7.9
8.2
9.7
7.2
7.8
7.9
8.6
1996
7.5
10.0
8.7
7.4
7.8
6.7
7.2
6.9
6.4
10.6
8.3
7.7
1997
8.8
7.7
8.0
8.3
8.9
6.9
7.0
6.8
8.2
9.2
7.6
7.0
1998
6.8
7.1
8.2
7.9
8.1
7.1
6.4
6.3
6.8
8.7
7.7
7.7
1999
7.5
9.2
8.3
7.7
9.6
7.7
7.0
6.2
6.9
8.1
7.8
7.9
2000
7.2
7.8
8.3
8.4
8.2
8.6
6.6
7.2
7.6
7.2
7.8
6.4
2001
7.3
7.9
7.7
8.7
8.5
7.8
6.7
6.7
6.0
8.3
8.7
9.0
2002
7.0
8.7
9.0
8.9
8.6
8.3
6.5
7.7
7.3
7.2
7.6
8.1
2003
8.7
8.2
8.1
9.4
8.3
6.4
6.1
6.4
8.3
7.5
8.6
7.4
2004
7.4
7.4
9.5
9.0
9.6
8.3
6.5
7.1
8.7
8.8
7.8
8.6
2005
7.3
7.7
7.3
9.1
9.1
8.7
7.5
7.1
7.9
8.0
9.0
7.1
2006
8.2
7.0
8.1
9.3
9.0
6.6
7.3
7.6
7.0
8.6
8.2
6.8
2007
7.7
8.4
9.4
8.7
10.1
8.5
7.0
7.7
9.4
8.7
8.5
7.2
2008
7.2
6.9
8.0
9.3
8.6
8.5
7.6
6.7
6.7
7.5
7.9
6.8
2009
6.5
6.6
7.8
7.5
8.6
6.8
6.3
5.8
4.4
6.1
5.7
6.3
2010
6.4
4.7
5.9
7.7
6.3
5.6
6.0
6.5
7.3
7.2
8.2
6.9
2011
6.4
8.2
7.3
8.3
8.6
7.9
5.7
5.0
5.8
6.8
6.9
7.1
2012
7.6
6.4
7.3
7.4
6.9
5.8
5.0
5.0
5.7
6.9
6.8
5.4
2013
7.2
5.7
6.3
7.5
7.9
5.8
5.0
4.1
5.9
5.8
7.5
5.8
2014
8.0
8.8
7.9
9.3
7.1
7.8
6.1
5.0
6.6
7.8
7.9
6.7
2015
7.7
7.8
8.2
8.5
7.2
5.3
6.2
6.5
6.0
6.9
6.9
6.6
2016
6.7
7.2
5.6
8.3
7.1
6.9
5.6
5.3
6.5
7.1
7.0
8.0
2017
6.7
7.9
8.0
7.5
7.3
6.7
5.1
4.3
6.4
7.7
8.4
6.8
2018
7.2
7.2
7.2
7.4
6.2
6.2
5.8
5.1
6.8
7.6
7.1
6.4
2019
6.5
6.8
7.4
7.5
6.7
5.6
5.0
5.3
6.4
7.4
7.0
6.6
2020
6.1
6.4
7.3
8.5
7.0
7.2
5.0
5.4
6.2
6.6
7.2
6.2
2021
5.6
6.3
7.8
7.1
6.6
5.6
4.7
6.2
5.7
6.2
7.2
7.7
2022
7.5
7.4
8.2
9.1
8.1
7.4
5.9
4.9
5.8
7.2
7.4
3.0
2023
5.9
7.4
7.7
8.5
7.6
5.7
4.5
5.0
5.9
4.0
7.3
6.4
2024
6.1
6.9
8.4
8.1
8.2
M
M
M
M
M
M
M
NCEI Climatology
M
M
M
M
M
M
M
M
M
M
M
M
Average Daily High Temperature [F]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1948
10.13
13.76
28.48
46.93
63.26
69.23
76.13
75.81
71.33
55.77
33.40
19.48
1949
14.42
13.39
27.71
52.17
62.65
72.60
75.71
77.39
60.77
50.65
34.40
16.65
1950
2.32
19.29
26.03
37.20
58.35
68.17
73.45
69.55
64.83
53.26
25.83
11.48
1951
9.97
19.50
26.16
43.53
66.84
69.50
75.71
68.94
59.10
47.61
26.13
13.32
1952
11.94
25.93
29.06
59.23
63.81
72.17
75.84
73.29
65.87
47.39
35.03
23.74
1953
15.29
19.11
33.35
44.33
60.94
70.70
75.97
77.00
61.33
60.48
39.90
19.58
1954
6.00
31.29
27.26
43.20
52.65
72.17
77.87
71.29
59.93
50.19
36.20
24.13
1955
13.58
15.57
24.23
57.20
65.90
72.33
80.58
78.52
62.60
53.06
25.03
13.48
1956
19.00
19.10
28.16
42.00
58.39
78.23
72.71
73.10
60.70
59.87
34.90
19.52
1957
6.90
18.14
32.90
48.23
64.61
67.73
80.48
73.03
62.37
53.68
32.00
22.77
1958
21.97
18.46
37.71
53.97
63.74
67.97
74.23
73.19
64.47
55.32
34.17
10.90
1959
5.03
17.79
34.23
47.77
62.68
74.93
78.81
76.94
63.10
45.42
23.87
26.81
1960
15.45
21.69
26.45
46.37
64.00
69.83
78.39
77.74
64.90
53.52
34.33
15.52
1961
12.71
28.29
38.52
44.00
63.39
76.97
78.23
78.58
61.27
53.74
34.27
17.58
1962
8.26
14.25
34.06
45.07
63.29
72.53
73.61
74.42
62.97
55.00
37.90
19.77
1963
4.35
13.86
38.65
50.90
60.71
74.87
78.26
74.97
68.73
66.16
39.30
11.71
1964
20.87
24.41
28.45
50.67
66.61
70.90
80.61
69.68
62.47
53.32
34.47
11.94
1965
9.13
14.86
24.13
46.47
63.35
70.90
73.03
73.52
53.70
52.23
32.93
23.68
1966
0.16
15.54
34.26
41.30
56.48
72.80
79.81
72.00
64.73
50.23
26.83
15.77
1967
13.84
10.79
30.35
44.67
55.68
69.50
74.65
72.39
67.97
48.48
29.83
17.48
1968
14.74
17.24
37.84
47.43
56.81
68.03
74.94
71.16
65.30
52.16
31.63
15.29
1969
8.97
20.46
29.26
54.33
60.00
63.13
74.81
78.52
63.80
43.68
33.33
20.84
1970
7.42
16.93
28.87
44.63
55.45
74.87
80.87
77.42
64.80
50.77
30.07
13.52
1971
2.87
20.18
30.32
48.73
61.74
74.37
72.58
75.03
65.37
52.32
29.83
17.39
1972
4.87
13.38
28.61
45.43
71.06
74.53
73.32
75.81
61.20
47.52
30.23
12.19
1973
20.26
21.00
41.19
47.93
63.58
75.60
79.29
78.84
63.17
56.19
31.63
15.94
1974
10.06
19.54
27.29
47.73
56.71
73.30
81.42
71.13
58.37
53.03
33.63
25.26
1975
15.58
18.36
26.00
42.37
67.61
70.90
81.58
72.74
60.50
54.10
37.57
16.65
1976
11.42
26.72
28.55
54.07
65.19
75.87
77.90
77.00
66.43
44.87
27.27
7.65
1977
3.45
21.71
39.00
54.80
73.06
71.63
78.00
67.87
60.30
53.16
30.67
11.74
1978
5.71
14.00
29.97
46.47
68.00
71.73
73.29
72.84
65.23
52.81
29.70
11.71
1979
1.65
9.54
28.77
42.90
55.03
70.60
77.13
70.97
63.53
44.68
29.27
24.16
1980
12.19
19.24
29.39
56.80
72.06
73.37
81.00
74.19
61.73
46.87
33.67
14.00
1981
17.26
23.18
37.55
51.13
65.26
71.10
80.84
77.68
63.73
48.13
42.50
17.68
1982
1.52
16.54
28.68
47.07
66.90
66.70
77.68
72.29
63.13
51.65
29.57
24.39
1983
19.45
25.11
34.42
48.00
60.42
72.57
79.65
79.77
63.83
49.68
32.33
4.48
1984
10.84
29.69
27.84
55.13
60.23
71.47
76.10
78.55
58.83
51.90
33.50
13.23
1985
10.52
15.00
35.87
51.23
65.65
64.67
74.71
69.00
60.37
51.81
23.23
8.77
1986
17.23
18.32
38.10
53.17
68.00
72.13
76.87
72.81
61.17
50.81
28.20
25.16
1987
20.58
31.21
39.16
63.50
67.87
77.47
78.71
73.19
66.13
46.97
38.90
25.45
1988
10.90
15.66
31.06
52.43
71.97
80.70
81.10
74.35
63.13
47.52
31.50
18.65
1989
19.97
10.71
27.52
46.37
66.55
71.70
81.29
76.19
66.87
53.87
28.97
8.13
1990
24.68
23.18
37.32
49.73
61.97
73.43
77.42
77.87
66.53
51.48
36.13
16.23
1991
10.97
26.39
36.19
55.90
69.42
77.13
77.26
80.97
62.07
46.58
26.83
21.90
1992
21.39
25.69
33.55
44.17
67.87
69.13
70.13
70.45
63.87
51.06
29.57
16.71
1993
15.00
20.43
36.42
49.03
62.32
69.43
72.90
75.16
58.10
47.52
30.83
20.65
1994
2.13
15.21
38.48
50.20
66.45
74.77
74.74
72.32
68.37
55.68
38.80
27.32
1995
18.23
18.75
35.81
43.70
63.42
81.03
76.84
78.55
65.10
49.06
22.83
15.29
1996
7.19
18.41
27.03
42.13
61.16
74.73
75.29
78.29
65.03
50.23
25.50
12.77
1997
10.32
21.89
30.29
47.00
57.13
75.20
75.94
73.94
67.77
51.13
29.73
27.45
1998
19.00
34.14
35.13
57.20
69.35
68.73
75.81
77.74
69.13
53.03
32.93
19.13
1999
13.65
29.14
37.13
54.03
65.55
72.37
77.81
72.97
60.60
49.84
43.10
26.68
2000
16.45
30.77
44.26
50.30
65.19
68.10
77.03
74.87
64.37
55.74
33.87
7.62
2001
24.56
15.26
33.97
50.91
66.63
74.90
78.94
79.27
67.48
50.47
45.33
27.03
2002
21.51
30.22
25.55
47.97
59.65
75.27
81.74
75.23
69.43
41.35
30.80
25.39
2003
14.58
16.18
32.00
52.30
68.32
74.03
77.87
79.94
65.63
53.48
30.23
25.94
2004
6.58
25.00
35.42
49.60
56.87
68.80
75.35
67.55
69.70
52.39
39.33
20.19
2005
11.16
25.04
32.35
56.67
59.90
72.97
78.61
73.39
68.93
52.77
35.27
21.16
2006
27.06
17.04
34.81
59.50
65.52
74.97
82.00
76.61
65.93
47.68
36.27
26.87
2007
19.16
12.57
37.29
50.30
67.29
75.37
79.35
75.29
65.57
53.32
32.77
17.61
2008
16.55
17.68
28.95
46.42
58.98
69.85
74.74
75.51
64.76
52.75
33.68
11.07
2009
10.60
20.61
32.92
49.46
59.47
70.03
71.36
72.73
73.14
45.20
43.77
15.10
2010
17.94
23.88
46.35
59.70
66.22
70.39
78.65
77.93
60.83
58.21
38.72
16.84
2011
10.23
21.84
32.75
49.42
63.39
70.51
81.05
78.71
68.09
57.59
39.03
27.13
2012
23.14
30.20
50.39
52.03
66.48
77.50
82.94
77.42
67.03
49.52
34.27
20.06
2013
16.77
21.58
30.35
41.10
61.61
73.27
76.48
76.84
69.70
51.26
32.87
7.49
2014
8.39
11.25
27.29
44.87
62.90
71.23
75.77
74.48
65.40
53.06
27.07
24.29
2015
17.55
10.39
38.90
53.30
63.65
73.90
79.09
74.65
71.77
54.81
41.43
28.65
2016
17.40
23.52
40.90
47.93
67.68
72.20
78.16
76.94
67.43
54.32
46.13
19.42
2017
20.35
27.11
34.94
51.93
61.42
73.47
78.37
74.20
67.30
54.61
30.94
14.71
2018
17.23
17.61
35.84
43.73
72.19
75.30
79.48
76.71
64.77
44.55
26.90
25.06
2019
11.10
15.75
32.39
49.27
60.06
74.37
79.48
75.19
64.47
48.87
29.17
22.84
2020
20.26
24.10
38.26
47.87
64.29
76.07
81.29
77.75
64.90
43.84
40.33
25.90
2021
24.16
14.71
45.48
51.27
68.19
80.40
82.74
79.10
71.17
58.13
36.67
23.26
2022
10.39
13.43
32.23
40.37
63.68
73.60
76.71
76.77
67.53
55.32
34.80
20.38
2023
20.84
24.61
31.48
45.50
70.58
78.63
75.54
74.65
69.13
56.10
37.00
33.74
2024
20.23
32.17
35.03
51.83
63.27
M
M
M
M
M
M
M
NCEI Climatology
15.70
21.91
35.40
50.10
64.21
73.50
77.70
76.00
66.40
51.21
34.41
20.80
Average Daily Low Temperature [F]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1948
-9.32
-9.07
9.16
30.17
41.42
49.87
56.84
55.23
46.43
34.52
24.17
1.90
1949
-3.90
-8.64
7.10
31.80
41.77
52.47
56.52
57.65
41.43
34.13
24.07
-1.00
1950
-16.87
-3.32
4.10
22.37
37.97
48.33
53.77
48.10
45.53
37.74
14.17
-4.00
1951
-8.39
1.61
7.16
28.60
44.32
49.07
53.35
51.58
42.53
34.55
13.37
-0.94
1952
-8.58
8.00
11.26
32.63
39.97
53.00
55.52
52.10
45.93
27.90
20.90
12.00
1953
-3.13
0.50
15.42
27.60
39.55
51.70
54.61
57.16
43.83
38.68
25.73
2.26
1954
-12.68
11.50
7.48
25.60
37.71
52.70
55.10
52.58
44.23
33.16
25.17
10.71
1955
-5.39
-4.46
-0.29
36.13
43.68
53.37
60.03
56.87
43.70
35.58
10.97
-6.52
1956
-1.16
-6.38
4.71
23.47
35.65
53.40
52.03
50.90
37.83
37.03
19.77
0.13
1957
-15.97
-4.79
8.06
27.57
38.74
46.87
57.48
52.03
41.10
34.42
19.93
3.97
1958
3.16
-3.86
19.35
29.97
37.00
43.17
53.13
49.68
44.53
34.55
17.67
-11.00
1959
-15.23
-10.21
11.74
25.47
41.52
52.17
55.13
55.06
43.80
32.29
6.80
10.77
1960
-3.68
0.07
3.68
27.70
40.71
47.07
53.26
54.84
42.60
34.32
21.87
-4.97
1961
-9.00
6.36
19.26
25.27
37.65
50.23
55.06
53.26
43.83
34.55
19.23
2.52
1962
-13.42
-6.79
17.84
24.07
42.16
50.73
52.68
52.29
41.47
35.29
25.37
1.35
1963
-13.45
-8.54
13.84
30.33
38.32
53.60
57.55
52.42
46.33
42.58
24.33
-4.77
1964
1.90
-0.41
3.16
27.77
43.52
49.50
56.94
50.68
40.97
33.13
19.83
-6.97
1965
-11.00
-9.00
3.35
30.20
41.97
49.30
54.81
52.00
39.83
36.65
18.00
11.55
1966
-18.58
-6.29
18.29
27.70
37.71
53.43
60.61
54.06
43.47
33.68
13.17
-0.81
1967
-5.35
-13.39
11.61
27.53
35.45
51.43
55.42
51.84
45.10
33.90
16.70
2.10
1968
-5.55
-3.83
18.26
29.90
40.65
51.23
55.81
52.19
47.73
36.55
21.73
1.68
1969
-5.71
2.82
9.00
32.40
39.06
43.33
54.94
56.48
45.67
31.74
18.03
9.26
1970
-10.23
-5.04
7.58
30.27
38.71
55.30
59.74
53.23
46.30
37.26
19.27
-5.13
1971
-14.71
1.50
13.68
30.17
40.00
55.07
52.23
52.00
45.23
38.45
20.43
1.00
1972
-13.94
-6.86
11.81
28.37
47.97
52.17
55.00
55.90
41.53
32.48
21.47
-3.13
1973
-0.58
-1.93
24.48
28.33
41.00
53.57
57.35
57.61
43.07
39.19
18.73
1.45
1974
-10.13
-4.96
6.94
28.40
37.81
49.73
58.58
52.32
39.10
34.03
22.17
9.35
1975
-1.94
-3.04
5.71
24.23
43.32
51.40
58.71
51.52
40.77
35.71
20.27
-1.97
1976
-10.48
4.48
6.58
31.67
37.65
53.23
54.00
52.97
40.93
27.68
12.10
-12.87
1977
-14.23
4.14
20.19
30.83
49.32
52.13
55.94
45.84
45.03
33.77
15.23
-3.81
1978
-11.61
-7.46
8.23
27.23
43.71
48.30
54.06
52.97
47.27
34.65
12.13
-9.61
1979
-17.23
-9.96
11.06
24.87
37.32
48.57
55.29
49.32
42.90
29.32
15.47
6.16
1980
-7.10
-0.38
5.10
32.17
45.68
50.53
57.23
55.16
43.77
31.13
19.80
-4.23
1981
-3.26
6.18
20.23
30.70
41.52
51.63
57.06
57.87
44.67
33.06
27.90
4.26
1982
-21.48
-2.86
10.03
24.37
45.03
46.13
56.87
50.06
44.77
38.45
13.63
8.68
1983
3.74
8.86
20.97
28.60
37.06
51.00
59.16
57.74
46.30
34.06
23.37
-12.42
1984
-8.19
13.24
7.58
32.27
37.87
51.73
54.06
56.58
39.40
37.55
17.87
-5.71
1985
-9.74
-4.46
17.84
32.07
43.45
44.60
52.26
51.03
42.67
32.65
6.20
-7.55
1986
-1.68
1.25
17.84
33.37
44.26
49.30
56.90
49.52
43.93
33.00
11.97
7.45
1987
1.84
16.29
20.35
33.20
44.03
51.60
57.13
51.87
46.60
30.23
23.30
12.19
1988
-9.13
-10.24
13.39
27.13
45.10
54.90
55.87
56.03
45.17
28.48
21.13
-0.42
1989
-2.48
-12.93
6.68
26.07
40.68
49.13
58.29
54.58
44.07
33.52
13.27
-10.29
1990
2.87
-2.89
16.74
28.53
37.94
53.07
54.58
54.35
45.43
30.52
20.73
-3.74
1991
-10.32
4.61
14.84
33.83
47.55
55.50
55.81
55.35
42.43
30.13
13.93
4.42
1992
3.42
7.69
14.68
27.43
42.90
47.13
48.97
50.39
42.30
30.81
21.27
1.29
1993
-5.03
-1.57
14.90
28.77
39.74
48.63
56.03
55.26
39.50
28.06
15.33
6.29
1994
-16.90
-4.32
19.77
27.70
42.94
53.57
55.13
51.55
47.37
39.58
23.40
11.13
1995
1.68
-4.64
18.35
24.47
41.35
55.60
55.74
55.97
41.37
34.90
8.20
-3.03
1996
-16.74
-2.66
4.35
22.40
38.94
52.50
53.97
52.87
43.87
32.03
10.17
-1.13
1997
-8.77
-3.96
5.45
23.60
35.32
50.47
52.97
46.84
42.30
33.16
15.60
13.03
1998
4.71
19.82
15.42
29.87
41.26
51.13
52.52
53.90
43.00
35.23
20.57
0.71
1999
-5.61
10.18
17.23
30.23
42.94
49.57
55.58
51.45
42.90
30.65
24.43
8.65
2000
-6.74
7.48
20.42
28.56
43.00
46.93
55.16
53.16
40.60
33.06
23.53
-9.74
2001
2.58
-11.50
10.65
30.30
39.93
48.67
53.89
52.71
41.81
30.53
28.35
10.17
2002
2.31
7.22
5.26
26.83
32.39
51.43
55.58
52.87
44.27
25.03
15.13
9.35
2003
-4.81
-8.04
9.65
26.70
38.13
48.00
50.35
53.45
42.83
32.26
14.43
7.52
2004
-14.81
3.41
12.77
25.00
33.29
43.37
50.29
44.55
47.30
34.84
21.97
-1.81
2005
-9.58
2.61
6.65
31.67
39.71
52.13
53.35
49.42
42.60
33.65
19.43
9.10
2006
10.45
-8.46
16.87
32.90
44.03
49.00
55.19
49.48
40.03
27.81
21.20
9.87
2007
-0.23
-7.50
15.23
24.00
42.77
50.53
51.74
47.81
42.20
35.48
19.20
-0.55
2008
-6.37
-9.62
6.89
25.32
31.95
45.98
49.94
48.79
42.10
32.66
19.63
-11.09
2009
-16.70
-4.49
10.57
27.77
33.19
45.48
46.22
47.86
46.27
30.21
24.88
0.44
2010
-4.18
-6.47
23.07
31.87
40.66
47.93
54.57
54.36
38.86
33.54
19.15
-1.11
2011
-12.32
-3.53
10.39
29.52
38.34
46.86
53.87
49.67
37.90
35.21
19.00
10.24
2012
5.00
9.07
25.94
27.67
39.48
48.20
55.10
46.61
35.93
28.67
17.99
2.81
2013
-5.49
-5.71
1.58
21.30
37.95
47.19
53.33
49.42
45.83
31.58
17.33
-15.68
2014
-15.07
-11.68
-1.45
24.35
39.84
51.60
49.97
48.87
43.30
31.71
10.60
10.84
2015
-4.94
-14.32
15.03
25.60
36.65
45.90
53.26
51.00
46.23
31.90
25.20
16.03
2016
2.61
1.38
17.48
26.60
38.16
47.67
53.65
50.77
46.73
34.84
28.33
2.39
2017
1.26
7.25
13.52
27.57
36.77
48.47
50.18
46.97
44.73
33.07
14.10
-2.97
2018
-6.35
-11.00
11.71
18.37
40.42
51.60
53.65
49.87
42.87
30.84
14.13
6.52
2019
-10.77
-8.82
8.90
27.50
35.52
46.07
52.77
49.55
47.07
34.65
17.23
4.35
2020
2.29
-6.21
12.48
23.40
37.16
50.87
53.65
51.29
40.23
26.27
21.77
8.29
2021
5.87
-9.39
20.16
28.17
38.94
50.63
54.00
55.32
46.87
40.52
18.97
3.58
2022
-14.68
-16.04
8.65
24.57
40.84
47.97
54.19
54.55
44.70
34.26
19.17
-1.46
2023
5.06
-3.14
6.84
25.07
44.29
53.97
51.13
52.39
47.73
39.81
20.77
21.68
2024
7.81
12.34
14.94
29.77
39.12
M
M
M
M
M
M
M
NCEI Climatology
-5.80
-2.40
11.80
26.10
38.11
48.20
52.01
49.70
42.00
31.10
18.10
2.69
Average Daily Temperature (high+low)/2 [F]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1948
0.40
2.34
18.82
38.55
52.34
59.55
66.48
65.52
58.88
45.15
28.78
10.69
1949
5.26
2.38
17.40
41.98
52.21
62.53
66.11
67.52
51.10
42.39
29.23
7.82
1950
-7.27
7.98
15.06
29.78
48.16
58.25
63.61
58.82
55.18
45.50
20.00
3.74
1951
0.79
10.55
16.66
36.07
55.58
59.28
64.53
60.26
50.82
41.08
19.75
6.19
1952
1.68
16.97
20.16
45.93
51.89
62.58
65.68
62.69
55.90
37.65
27.97
17.87
1953
6.08
9.80
24.39
35.97
50.24
61.20
65.29
67.08
52.58
49.58
32.82
10.92
1954
-3.34
21.39
17.37
34.40
45.18
62.43
66.48
61.94
52.08
41.68
30.68
17.42
1955
4.10
5.55
11.97
46.67
54.79
62.85
70.31
67.69
53.15
44.32
18.00
3.48
1956
8.92
6.36
16.44
32.73
47.02
65.82
62.37
62.00
49.27
48.45
27.33
9.82
1957
-4.53
6.68
20.48
37.90
51.68
57.30
68.98
62.53
51.73
44.05
25.97
13.37
1958
12.56
7.30
28.53
41.97
50.37
55.57
63.68
61.44
54.50
44.94
25.92
-0.05
1959
-5.10
3.79
22.98
36.62
52.10
63.55
66.97
66.00
53.45
38.85
15.33
18.79
1960
5.89
10.88
15.06
37.03
52.35
58.45
65.82
66.29
53.75
43.92
28.10
5.27
1961
1.85
17.32
28.89
34.63
50.52
63.60
66.65
65.92
52.55
44.15
26.75
10.05
1962
-2.58
3.73
25.95
34.57
52.73
61.63
63.15
63.35
52.22
45.15
31.63
10.56
1963
-4.55
2.66
26.24
40.62
49.52
64.23
67.90
63.69
57.53
54.37
31.82
3.47
1964
11.39
12.00
15.81
39.22
55.06
60.20
68.77
60.18
51.72
43.23
27.15
2.48
1965
-0.94
2.93
13.74
38.33
52.66
60.10
63.92
62.76
46.77
44.44
25.47
17.61
1966
-9.21
4.62
26.27
34.50
47.10
63.12
70.21
63.03
54.10
41.95
20.00
7.48
1967
4.24
-1.30
20.98
36.10
45.56
60.47
65.03
62.11
56.53
41.19
23.27
9.79
1968
4.60
6.71
28.05
38.67
48.73
59.63
65.37
61.68
56.52
44.35
26.68
8.48
1969
1.63
11.64
19.13
43.37
49.53
53.23
64.87
67.50
54.73
37.71
25.68
15.05
1970
-1.40
5.95
18.23
37.45
47.08
65.08
70.31
65.32
55.55
44.02
24.67
4.19
1971
-5.92
10.84
22.00
39.45
50.87
64.72
62.40
63.52
55.30
45.39
25.13
9.19
1972
-4.53
3.26
20.21
36.90
59.52
63.35
64.16
65.85
51.37
40.00
25.85
4.53
1973
9.84
9.54
32.84
38.13
52.29
64.58
68.32
68.23
53.12
47.69
25.18
8.69
1974
-0.03
7.29
17.11
38.07
47.26
61.52
70.00
61.73
48.73
43.53
27.90
17.31
1975
6.82
7.66
15.85
33.30
55.47
61.15
70.15
62.13
50.63
44.90
28.92
7.34
1976
0.47
15.60
17.56
42.87
51.42
64.55
65.95
64.98
53.68
36.27
19.68
-2.61
1977
-5.39
12.93
29.60
42.82
61.19
61.88
66.97
56.85
52.67
43.47
22.95
3.97
1978
-2.95
3.27
19.10
36.85
55.85
60.02
63.68
62.90
56.25
43.73
20.92
1.05
1979
-7.79
-0.21
19.92
33.88
46.18
59.58
66.21
60.15
53.22
37.00
22.37
15.16
1980
2.55
9.43
17.24
44.48
58.87
61.95
69.11
64.68
52.75
39.00
26.73
4.89
1981
7.00
14.68
28.89
40.92
53.39
61.37
68.95
67.77
54.20
40.60
35.20
10.97
1982
-9.98
6.84
19.35
35.72
55.97
56.42
67.27
61.18
53.95
45.05
21.60
16.53
1983
11.60
16.98
27.69
38.30
48.74
61.78
69.40
68.76
55.07
41.87
27.85
-3.97
1984
1.32
21.47
17.71
43.70
49.05
61.60
65.08
67.56
49.12
44.73
25.68
3.76
1985
0.39
5.27
26.85
41.65
54.55
54.63
63.48
60.02
51.52
42.23
14.72
0.61
1986
7.77
9.79
27.97
43.27
56.13
60.72
66.89
61.16
52.55
41.90
20.08
16.31
1987
11.21
23.75
29.76
48.35
55.95
64.53
67.92
62.53
56.37
38.60
31.10
18.82
1988
0.89
2.71
22.23
39.78
58.53
67.80
68.48
65.19
54.15
38.00
26.32
9.11
1989
8.74
-1.11
17.10
36.22
53.61
60.42
69.79
65.39
55.47
43.69
21.12
-1.08
1990
13.77
10.14
27.03
39.13
49.95
63.25
66.00
66.11
55.98
41.00
28.43
6.24
1991
0.32
15.50
25.52
44.87
58.48
66.32
66.53
68.16
52.25
38.35
20.38
13.16
1992
12.40
16.69
24.11
35.80
55.39
58.13
59.55
60.42
53.08
40.94
25.42
9.00
1993
4.98
9.43
25.66
38.90
51.03
59.03
64.47
65.21
48.80
37.79
23.08
13.47
1994
-7.39
5.45
29.13
38.95
54.69
64.17
64.94
61.94
57.87
47.63
31.10
19.23
1995
9.95
7.05
27.08
34.08
52.39
68.32
66.29
67.26
53.23
41.98
15.52
6.13
1996
-4.77
7.88
15.69
32.27
50.05
63.62
64.63
65.58
54.45
41.13
17.83
5.82
1997
0.77
8.96
17.87
35.30
46.23
62.83
64.45
60.39
55.03
42.15
22.67
20.24
1998
11.85
26.98
25.27
43.53
55.31
59.93
64.16
65.82
56.07
44.13
26.75
9.92
1999
4.02
19.66
27.18
42.13
54.24
60.97
66.69
62.21
51.75
40.24
33.77
17.66
2000
4.86
19.13
32.34
39.43
54.10
57.52
66.10
64.02
52.48
44.40
28.70
-1.06
2001
13.57
1.88
22.31
40.60
53.28
61.78
66.42
65.99
54.64
40.50
36.84
18.60
2002
11.91
18.72
15.40
37.40
46.02
63.35
68.66
64.05
56.85
33.19
22.97
17.37
2003
4.89
4.07
20.82
39.50
53.23
61.02
64.11
66.69
54.23
42.87
22.33
16.73
2004
-4.11
14.21
24.10
37.30
45.08
56.08
62.82
56.05
58.50
43.61
30.65
9.19
2005
0.79
13.82
19.50
44.17
49.81
62.55
65.98
61.40
55.77
43.21
27.35
15.13
2006
18.76
4.29
25.84
46.20
54.77
61.98
68.60
63.05
52.98
37.74
28.73
18.37
2007
9.47
2.54
26.26
37.15
55.03
62.95
65.55
61.55
53.88
44.40
25.98
8.53
2008
5.09
4.03
17.92
35.87
45.46
57.92
62.34
62.15
53.43
42.70
26.66
-0.01
2009
-3.05
8.06
21.75
38.62
46.33
57.76
58.79
60.30
59.71
37.70
34.33
7.77
2010
6.88
8.71
34.71
45.78
53.44
59.16
66.61
66.14
49.85
45.88
28.94
7.87
2011
-1.04
9.15
21.57
39.47
50.86
58.68
67.46
64.19
52.99
46.40
29.01
18.69
2012
14.07
19.63
38.16
39.85
52.98
62.85
69.02
62.02
51.48
39.10
26.13
11.44
2013
5.64
7.93
15.97
31.20
49.78
60.23
64.91
63.13
57.77
41.42
25.10
-4.10
2014
-3.34
-0.21
12.92
34.61
51.37
61.42
62.87
61.68
54.35
42.39
18.83
17.56
2015
6.31
-1.96
26.97
39.45
50.15
59.90
66.17
62.82
59.00
43.35
33.32
22.34
2016
10.01
12.45
29.19
37.27
52.92
59.93
65.90
63.85
57.08
44.58
37.23
10.90
2017
10.81
17.18
24.23
39.75
49.10
60.97
64.28
60.58
56.02
43.84
22.52
5.87
2018
5.44
3.30
23.77
31.05
56.31
63.45
66.56
63.29
53.82
37.69
20.52
15.79
2019
0.16
3.46
20.65
38.38
47.79
60.22
66.13
62.37
55.77
41.76
23.20
13.60
2020
11.27
8.95
25.37
35.63
50.73
63.47
67.47
64.52
52.57
35.05
31.05
17.10
2021
15.02
2.66
32.82
39.72
53.56
65.52
68.37
67.21
59.02
49.32
27.82
13.42
2022
-2.15
-1.30
20.44
32.47
52.26
60.78
65.45
65.66
56.12
44.79
26.98
9.46
2023
12.95
10.73
19.16
35.28
57.44
66.30
63.33
63.52
58.43
47.95
28.88
27.71
2024
14.02
22.26
24.98
40.80
51.19
M
M
M
M
M
M
M
NCEI Climatology
4.95
9.76
23.60
38.10
51.16
60.85
64.85
62.85
54.20
41.15
26.25
11.75
Average Relative Humidity [%]
This value is computed via a simple average of available observations weighted
by the duration between observations.
