Logan County climate

Logan County Frost Dates and Growing Season

NOAA 1991-2020 normals for Guthrie Muni AP, 7.9 km from Logan County, elevation 1068 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Guthrie Muni AP. A median date has an even chance of a later freeze in spring, or an earlier one in fall.

The last spring freeze typically comes around April 3 and the first fall freeze around November 1, a growing season of about 211 days.

Median at 36°F
last April 14, first October 25
Median at 32°F
last April 3, first November 1
Median at 28°F
last March 23, first November 11

Last freeze in spring

The chance of a later freeze than the date shown. At 10 percent, one spring in ten still freezes after the date; planting after the 10 percent date for 32°F is the cautious choice.

Threshold10%20%30%40%50%60%70%80%90%
36°FMay 2Apr 27Apr 22Apr 18Apr 14Apr 11Apr 8Apr 4Mar 30
32°FApr 20Apr 13Apr 9Apr 6Apr 3Mar 31Mar 28Mar 23Mar 17
28°FApr 8Apr 3Mar 31Mar 27Mar 23Mar 19Mar 15Mar 10Mar 3
24°FMar 31Mar 23Mar 18Mar 14Mar 11Mar 7Mar 3Feb 28Feb 23
20°FMar 17Mar 11Mar 8Mar 4Mar 1Feb 26Feb 22Feb 16Feb 8
16°FMar 9Mar 4Feb 28Feb 23Feb 17Feb 11Feb 5Jan 30Jan 19

First freeze in fall

The chance of an earlier freeze than the date shown. At 10 percent, one fall in ten freezes before the date.

Threshold10%20%30%40%50%60%70%80%90%
36°FOct 10Oct 16Oct 20Oct 22Oct 25Oct 28Oct 30Nov 2Nov 6
32°FOct 19Oct 24Oct 28Oct 31Nov 1Nov 4Nov 8Nov 11Nov 16
28°FOct 29Nov 1Nov 4Nov 8Nov 11Nov 14Nov 18Nov 22Nov 29
24°FNov 4Nov 9Nov 14Nov 18Nov 22Nov 26Nov 30Dec 3Dec 8
20°FNov 13Nov 21Nov 26Nov 30Dec 3Dec 6Dec 11Dec 17Dec 26
16°FNov 26Dec 1Dec 6Dec 12Dec 17Dec 23Dec 28Jan 2Jan 11

Growing season length

Days between the last spring and first fall freeze at each threshold, with the chance of a season at least that long.

Threshold10%20%30%40%50%60%70%80%90%
36°F212204200196191186182178171
32°F236228220216211207203196189
28°F258249242237233229223218209
24°F281274266262257251246238229
20°F306298291285279274269262252
16°F336325317310305299292285274

How often it gets that cold

The share of years with at least one night at or below each temperature.

36°F or colder
100% of years
32°F or colder
100% of years
28°F or colder
100% of years
24°F or colder
100% of years
20°F or colder
100% of years
16°F or colder
100% of years

Degree days

A degree day is one degree of the daily mean temperature beyond a base, for one day. Heating degree days count cold (the fuel a house burns), cooling degree days heat, growing degree days the warmth a crop needs; each crop has its own base.

Heating degree days, base 65°F
3,563
Cooling degree days, base 65°F
2,093
Growing degree days, base 40°F
8,079
Growing degree days, base 45°F
6,590
Growing degree days, base 50°F
5,247
Growing degree days, base 55°F
4,054
Growing degree days, base 60°F
3,002

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January829019
February633146
March43616157
April20056329
May48177594
June1393841
July05631,027
August0524989
September18279711
October17277385
November4577122
December769027

What this means

NOAA computes these from the daily lows at the station over 1991-2020, fitting the dates of each year's last and first freeze to a distribution, so a date can be stated at any level of risk. 36°F is a frost risk for tender plants on a clear, calm night, since the ground cools below the air above it; 32°F is a freeze; 28°F is a hard freeze that kills most annuals.

The station is 7.9 km from Logan County. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

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Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USW00053913 (Guthrie Muni AP). Public domain.