Nearly all of Iowa has probably not seen sub freezing temperatures yet this fall. The featured chart displays the date of the first sub freezing temperature for Ames along with the number of days afterwards until the first sub 29 degree temperature (typically considered the killing frost). A value of zero days would imply that the first day of sub freezing temperatures also dipped below 29. A final delineation is also provided with the size of the dots representing Jun/Jul/Aug precipitation with red dots being those years above 18 inches, like this year. The earliest freeze shown on this chart was in 1902, even after a wet summer. As for this year, our first good chance for a freeze is expected to arrive this weekend.

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Tags:   freeze