Green County climate

Green County Frost Dates and Growing Season

NOAA 1991-2020 normals for Greensburg, 4.7 km from Green County, elevation 585 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Greensburg. 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 15 and the first fall freeze around October 24, a growing season of about 192 days.

Median at 36°F
last April 26, first October 15
Median at 32°F
last April 15, first October 24
Median at 28°F
last April 1, first November 4

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 12May 6May 2Apr 29Apr 26Apr 23Apr 20Apr 16Apr 12
32°FMay 2Apr 26Apr 21Apr 18Apr 15Apr 12Apr 8Apr 5Mar 31
28°FApr 18Apr 12Apr 7Apr 4Apr 1Mar 30Mar 27Mar 22Mar 16
24°FApr 6Apr 1Mar 28Mar 25Mar 21Mar 17Mar 12Mar 7Feb 28
20°FMar 26Mar 21Mar 16Mar 12Mar 7Mar 3Feb 28Feb 23Feb 13
16°FMar 17Mar 11Mar 5Mar 1Feb 25Feb 20Feb 12Feb 5Jan 30

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 2Oct 6Oct 9Oct 12Oct 15Oct 17Oct 20Oct 23Oct 28
32°FOct 11Oct 16Oct 19Oct 22Oct 24Oct 27Oct 30Nov 2Nov 6
28°FOct 21Oct 26Oct 30Nov 1Nov 4Nov 7Nov 10Nov 14Nov 19
24°FNov 1Nov 5Nov 9Nov 12Nov 15Nov 18Nov 22Nov 26Dec 1
20°FNov 11Nov 16Nov 20Nov 25Nov 28Dec 1Dec 4Dec 10Dec 19
16°FNov 22Nov 29Dec 4Dec 8Dec 14Dec 20Dec 25Jan 1Jan 7

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°F191184179175171167163158151
32°F212206201196192188183178171
28°F236229224219215211208202194
24°F265257250245241235230225218
20°F296285277272267262256249241
16°F328317307301294288281273262

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
4,281
Cooling degree days, base 65°F
1,354
Growing degree days, base 40°F
6,806
Growing degree days, base 45°F
5,419
Growing degree days, base 50°F
4,184
Growing degree days, base 55°F
3,091
Growing degree days, base 60°F
2,151

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January927016
February739021
March578483
April28423235
May88110488
June7277720
July0389854
August1353817
September33171588
October24926269
November557170
December817024

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 4.7 km from Green 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 USC00153430 (Greensburg). Public domain.