Freezing Dates

Using the NWS COOP data archive, significant dates relating to fall are extracted and presented on this page. The specific dates are the first occurance of that temperature and may have occured again in subsequent years.
The "Record Lows" columns show the first fall occurance of a low temperature. The "Average Lows" column shows when certain climatological thresholds are surpassed in the fall.

Select Network:
COOP Site: Record Lows: Average Lows:
Temp <= 32°F Temp <= 28°F Below 40°F Below 32°F Below 28°F
Temp: Date: Temp: Date:
BATTLE CREEK 3NE 32 {2014}-09-13 24 {2012}-09-23 10-04 10-17 10-31
SIBLEY-5-NNE 30 {1950}-08-20 23 {1955}-09-11 10-07 10-26 11-03
CHEROKEE 31 {1974}-09-03 27 {1955}-09-11 10-07 10-27 11-07
ROCK-RAPIDS 31 {1974}-09-03 26 {1894}-09-10 10-07 10-24 11-05
Estherville 4E 32 {1924}-09-09 27 {1929}-09-18 10-07 10-27 11-06
LITTLE SIOUX 2NW 31 {2007}-09-15 27 {2012}-09-23 10-08 10-25 11-01
HOLSTEIN 5 NNW 30 {2020}-10-02 28 {2019}-10-12 10-08 10-15 10-27
Spencer Airport -1 {2010}-08-16 -1 {2010}-08-16 10-09 10-26 11-10
Spencer Area -1 {2010}-08-16 -1 {2010}-08-16 10-09 10-27 11-08
Elkader 6SSW (Osborn) 32 {1893}-08-29 0 {2002}-09-02 10-09 10-28 11-10
SIOUX-RAPIDS 31 {1974}-09-03 28 {1991}-09-19 10-09 10-27 11-07
SWEA CITY 4 W 32 {1974}-09-03 26 {1974}-09-22 10-09 10-29 11-10
Spencer 31 {1974}-09-03 28 {2007}-09-15 10-09 10-27 11-08
MASON CITY MUNICIPAL AP 31 {2014}-09-13 26 {2011}-09-15 10-09 10-28 11-07
MASON-CITY 30 {1915}-08-30 28 {1923}-09-14 10-10 10-28 11-09
DECORAH-2-N 32 {1915}-08-30 28 {1946}-09-02 10-10 11-01 11-11
CASCADE 32 {2023}-08-31 28 {1953,1974}-09-22 10-10 11-03 11-11
FAYETTE 32 {1949}-09-01 27 {1902}-09-12 10-10 10-28 11-10
POCAHONTAS 31 {1946}-09-02 27 {1929}-09-18 10-10 10-28 11-10
SANBORN 32 {1974}-09-03 25 {1929}-09-18 10-10 10-27 11-07
Milford 32 {1974}-09-03 28 {1929}-09-18 10-10 10-31 11-08
Oelwein Area 28 {1955}-09-11 28 {1955}-09-11 10-10 11-02 11-11
NORTHWOOD 32 {1953}-09-13 28 {1929}-09-18 10-10 10-28 11-08
ESTHERVILLE MUNICIPAL AP 31 {2014}-09-13 28 {2007}-09-15 10-10 10-26 11-07
STANLEY 31 {2014}-09-13 26 {2012}-09-23 10-11 10-27 11-01
SIOUX CITY ANG 31 {2012}-09-23 20 {2004}-10-02 10-11 10-27 11-10
IOWA-FALLS 31 {1915}-08-30 28 {1894}-09-18 10-12 11-01 11-10
HAMPTON-2-NW 32 {1955}-09-11 28 {1955}-09-12 10-12 11-01 11-10
Le Mars 31 {1955}-09-11 28 {1902}-09-12 10-12 10-29 11-08
WEBSTER-CITY 30 {1955}-09-11 25 {1929}-09-18 10-12 10-28 11-10
FOREST-CITY 31 {1949}-09-01 27 {1929}-09-18 10-13 10-28 11-10
NEW-HAMPTON 28 {1949}-09-01 28 {1949}-09-01 10-13 11-01 11-10
Emmetsburg 0 {2005}-09-03 0 {2005}-09-03 10-13 11-01 11-10
WATERLOO 32 {1917}-09-11 28 {1929}-09-18 10-13 11-02 11-10
Waterloo Area 32 {1917}-09-11 28 {1929}-09-18 10-13 11-02 11-11
MARSHALLTOWN 31 {1955}-09-12 28 {1896}-09-20 10-13 11-02 11-11
Iowa - Northwest Climate Division 30 {1902}-09-12 26 {1918}-09-20 10-13 10-31 11-10
GRUNDY-CENTER 32 {1902}-09-12 28 {1929}-09-18 10-13 11-02 11-11
MANCHESTER-2 32 {2014}-09-13 27 {1984}-09-16 10-13 11-02 11-11
OSAGE 30 {1949}-09-14 28 {1929}-09-18 10-13 11-01 11-10
OELWEIN 1E 32 {2011}-09-15 28 {2012}-10-05 10-13 10-28 11-11
WAUKON 32 {1937,2011}-09-16 25 {1942}-09-25 10-13 11-02 11-10
LOWDEN 32 {2014}-09-13 26 {2012}-09-24 10-14 11-01 11-11
AMES MUNICIPAL AP 31 {2007}-09-15 27 {2003}-09-30 10-14 10-31 11-11
MARSHALLTOWN MUNICIPAL AP 30 {2007}-09-15 27 {2012}-09-23 10-14 10-31 11-11
MAPLETON NO. 2 31 {1955}-09-11 27 {1991}-09-19 10-15 11-02 11-10
DAVENPORT WFO 30 {2012}-09-23 27 {2012}-10-05 10-15 10-29 11-11
ANAMOSA 3 SSW 30 {2012}-09-24 26 {2015}-10-17 10-15 10-29 11-12
ATLANTIC-1-NE 30 {1893}-09-02 28 {1902,1955}-09-12 10-16 11-01 11-10
SIOUX CENTER 2 SE 31 {1974}-09-03 24 {1991}-09-19 10-16 10-28 11-10
CARROLL-2-SSW 28 {1974}-09-03 28 {1974}-09-03 10-16 10-28 11-10
FORT-DODGE 32 {1974}-09-03 27 {1902}-09-13 10-16 11-02 11-11
Ida Grove Area 32 {1974}-09-03 27 {1918}-09-20 10-16 10-28 11-10
SAC-CITY 32 {1974}-09-03 28 {1918}-09-20 10-16 11-01 11-11
CHARLES-CITY 32 {1902,1955}-09-12 28 {1991}-09-20 10-16 11-02 11-11
PRIMGHAR 30 {1902}-09-12 25 {1901}-09-18 10-16 10-31 11-10
Dubuque Airport 32 {2007}-09-15 28 {1956}-09-20 10-16 11-03 11-13
RATHBUN DAM 0 {2012}-08-09 0 {2012}-08-09 10-17 11-07 11-21
JEFFERSON 32 {1893}-08-29 28 {1929}-09-18 10-17 11-02 11-11
ALLISON 32 {1915}-08-30 28 {1926}-09-25 10-17 11-02 11-11
BELLEVUE-L-AND-D-12 32 {1986}-08-30 28 {1974,1995}-09-23 10-17 11-06 11-21
ALGONA 29 {1893}-09-02 27 {1929}-09-18 10-17 11-01 11-10
Postville 32 {1919}-09-02 20 {1918}-09-21 10-17 11-02 11-11
OAKLAND-2-E 32 {1974}-09-03 28 {1995}-09-22 10-17 11-03 11-11
GRINNELL-3-SW 31 {1976}-09-10 27 {1991}-09-20 10-17 11-02 11-11
MAQUOKETA-2-W 31 {1917}-09-11 28 {1983}-09-23 10-17 11-02 11-12
BELLE-PLAINE 31 {1917}-09-11 28 {1916,1929}-09-18 10-17 11-03 11-12
TOLEDO 31 {1917}-09-11 27 {1896}-09-20 10-17 11-02 11-11
SPIRIT LAKE 31 {1902}-09-12 28 {1929}-09-18 10-17 11-01 11-10
CORNING 32 {1902}-09-12 27 {1983}-09-21 10-17 11-03 11-13
CHARITON 32 {1955}-09-12 28 {1918,1991}-09-20 10-17 11-05 11-21
PERRY 32 {1955}-09-12 27 {1929}-09-18 10-17 11-02 11-11
AUDUBON 30 {1902,1955}-09-12 27 {1896}-09-19 10-17 11-01 11-10
Iowa - West Central Climate Division 31 {1902}-09-12 28 {1918}-09-20 10-17 11-02 11-11
Iowa Drought Region 1 - Northwest 30 {1902}-09-12 25 {1918}-09-20 10-17 11-01 11-10
Boone 32 {1975}-09-12 27 {1929}-09-18 10-17 11-02 11-11
Iowa Drought Region 2 - Northcentral 32 {1902}-09-12 27 {1913}-09-22 10-17 11-02 11-11
GUTHRIE-CENTER 31 {1902}-09-12 28 {1991}-09-19 10-17 11-02 11-11
LOGAN 30 {1902}-09-12 28 {1902}-09-13 10-17 11-02 11-11
STORM-LAKE-2-E 32 {1902}-09-12 28 {1929}-09-18 10-17 11-01 11-10
Iowa - Northeast Climate Division 32 {1902}-09-13 26 {1926}-09-26 10-17 11-02 11-11
VINTON 32 {1902,1953}-09-13 28 {1982}-09-21 10-17 11-03 11-12
Ames Area 31 {1902}-09-13 26 {1918}-09-21 10-17 11-02 11-11
Iowa - North Central Climate Division 32 {1902,2014}-09-13 28 {1929}-09-18 10-17 11-02 11-10
Sioux City Area 30 {1902}-09-13 25 {1995}-09-22 10-17 11-02 11-10
SIOUX-CITY-WSO-AP 30 {1902}-09-13 25 {1995}-09-22 10-17 11-02 11-10
Cedar Rapids Airport 31 {2007}-09-15 28 {2012}-09-24 10-17 11-05 11-13
MUSCATINE 2N 27 {2003}-10-02 27 {2003}-10-02 10-17 11-11 11-22
WILLIAMSBURG 32 {1917}-09-11 28 {1991}-09-20 10-18 11-03 11-12
DENISON 29 {1902}-09-12 21 {1918}-09-21 10-18 11-02 11-11
AMES-8-WSW 31 {1902}-09-13 26 {1918}-09-21 10-18 11-02 11-12
CLARINDA 31 {1902}-09-13 28 {1918}-09-21 10-18 11-02 11-19
Cedar Rapids Area 31 {2007}-09-15 28 {2012}-09-24 10-18 11-03 11-19
Creston 31 {1924}-09-15 28 {1991}-09-19 10-18 11-03 11-13
RED-OAK 32 {1940}-09-11 28 {1995}-09-22 10-19 11-03 11-21
WINTERSET 31 {1955}-09-12 26 {1896}-09-20 10-19 11-07 11-21
Iowa Drought Region 4 - Southwest 32 {1902}-09-12 26 {1942}-09-28 10-19 11-05 11-19
Iowa Average 32 {1902}-09-13 24 {1942}-09-28 10-19 11-03 11-11
SIGOURNEY 32 {1902}-09-13 25 {1913}-09-21 10-19 11-08 11-22
MOUNT-AYR 32 {1902}-09-13 28 {1991}-09-19 10-19 11-05 11-19
Iowa Drought Region 3 - Northeast 32 {1902}-09-13 27 {1926}-09-26 10-19 11-03 11-12
AMES 5 SE 32 {1902}-09-13 28 {1926}-09-26 10-19 11-04 11-20
OSKALOOSA 31 {1902}-09-13 27 {1991}-09-20 10-19 11-08 11-21
Iowa City 32 {1923}-09-14 28 {1916}-09-18 10-19 11-06 11-21
OSCEOLA-3-WSW 31 {2007}-09-15 28 {1974}-09-22 10-19 11-07 11-21
Dubuque Area 32 {2007}-09-15 28 {1956}-09-20 10-19 11-05 11-21
SHENANDOAH-1-NE 32 {1937}-09-16 28 {1918}-09-20 10-19 11-07 11-21
GREENFIELD 32 {1981}-09-17 27 {1913}-09-22 10-19 11-08 11-21
Iowa - Central Climate Division 31 {1929}-09-18 28 {1913}-09-22 10-19 11-03 11-11
Allerton 31 {1991}-09-19 27 {1913}-09-22 10-19 11-08 11-21
BEACONSFIELD 27 {1991}-09-19 27 {1991}-09-19 10-19 11-05 11-20
Donnellson 31 {1991}-09-20 25 {1942}-09-28 10-19 11-10 11-22
IOWA CITY MUNICIPAL AP 32 {1991}-09-20 26 {1995}-09-23 10-19 11-07 11-21
CLINTON-1 31 {1902}-09-13 28 {1928}-09-25 10-20 11-09 11-22
CEDAR-RAPIDS-1 32 {2007}-09-15 24 {1926}-09-26 10-20 11-06 11-21
NEWTON 32 {1929}-09-18 23 {1942}-09-28 10-20 11-06 11-21
Iowa - East Central Climate Division 32 {1929}-09-18 28 {1926}-09-26 10-20 11-06 11-21
DES MOINES WSFO-JOHNSTON 31 {1999}-09-21 28 {2004}-10-02 10-21 11-10 11-12
FAIRFIELD 32 {1917}-09-11 28 {1918}-09-21 10-24 11-08 11-22
KEOSAUQUA 31 {1917}-09-11 28 {1916}-09-18 10-24 11-10 11-22
COLUMBUS JUNCT 2 SSW 31 {1955}-09-12 28 {1991}-09-20 10-24 11-08 11-22
Iowa - Southwest Climate Division 32 {1902}-09-13 26 {1942}-09-28 10-24 11-08 11-21
WASHINGTON 30 {1902}-09-13 28 {1983}-09-23 10-24 11-08 11-21
Ottumwa 32 {2007}-09-15 23 {1942}-09-28 10-24 11-09 11-22
GUTTENBERG-L-AND-D-10 32 {1973}-09-18 25 {1942}-09-28 10-24 11-07 11-21
Lamoni 32 {1901}-09-18 27 {1942}-09-28 10-24 11-08 11-21
Des Moines Airport 31 {1995}-09-22 26 {1942}-09-28 10-24 11-08 11-21
Des Moines Area 31 {1995}-09-22 26 {1942}-09-28 10-24 11-08 11-21
CENTERVILLE 31 {1913}-09-13 28 {1913}-09-22 10-25 11-10 11-22
MOUNT-PLEASANT 32 {1902}-09-13 28 {1942}-09-24 10-25 11-10 11-22
DUBUQUE-LOCK-AND-DAM 31 {1956}-09-20 24 {1899}-09-30 10-25 11-10 11-22
MUSCATINE 29 {1991}-09-20 23 {1942}-09-28 10-25 11-10 11-21
Iowa - Southeast Climate Division 32 {1896}-09-20 25 {1942}-09-28 10-25 11-09 11-22
Iowa - South Central Climate Division 32 {1918}-09-21 25 {1942}-09-28 10-25 11-08 11-21
Iowa Drought Region 5 - Southeast 32 {1918}-09-21 24 {1942}-09-28 10-25 11-08 11-21
LAMONI -1 {2011,2012}-08-07 -1 {2011,2012}-08-07 10-26 11-11 11-21
Burlington Airport 30 {1918}-09-18 25 {1942}-09-28 10-27 11-10 11-24
Fort Madison 32 {1913}-09-22 26 {1942}-09-28 10-27 11-11 11-24
BURLINGTON 32 {1984}-09-26 28 {1974}-10-02 10-28 11-11 11-27
Le Claire L&D 14 32 {1942}-09-26 28 {1942}-09-28 10-28 11-11 11-23
KEOKUK LOCK DAM 19 30 {1992}-09-23 23 {1952}-10-06 11-02 11-13 11-28