Allison climate

Allison Frost Dates and Growing Season

NOAA 1991-2020 normals for Uniontown 1 Ne, 14.9 km from Allison, elevation 956 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Uniontown 1 Ne. 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 30 and the first fall freeze around October 18, a growing season of about 171 days.

Median at 36°F
last May 10, first October 7
Median at 32°F
last April 30, first October 18
Median at 28°F
last April 17, first October 28

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 27May 22May 18May 14May 10May 7May 3Apr 30Apr 25
32°FMay 18May 12May 7May 3Apr 30Apr 27Apr 24Apr 20Apr 15
28°FMay 6Apr 30Apr 25Apr 20Apr 17Apr 13Apr 9Apr 4Mar 31
24°FApr 18Apr 13Apr 8Apr 5Apr 2Mar 31Mar 28Mar 23Mar 18
20°FApr 7Apr 2Mar 31Mar 27Mar 23Mar 19Mar 16Mar 10Mar 3
16°FMar 28Mar 22Mar 19Mar 15Mar 11Mar 7Mar 3Feb 27Feb 21

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°FSep 25Sep 29Oct 2Oct 5Oct 7Oct 10Oct 12Oct 15Oct 20
32°FOct 5Oct 9Oct 12Oct 15Oct 18Oct 21Oct 23Oct 26Oct 30
28°FOct 14Oct 19Oct 23Oct 25Oct 28Oct 31Nov 2Nov 5Nov 10
24°FOct 25Oct 31Nov 1Nov 4Nov 6Nov 10Nov 13Nov 18Nov 24
20°FNov 3Nov 8Nov 12Nov 15Nov 19Nov 23Nov 28Dec 2Dec 10
16°FNov 12Nov 19Nov 25Nov 30Dec 3Dec 8Dec 14Dec 20Dec 27

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°F170163158154150146140135127
32°F191184179174171167162157149
28°F216208203199195190185179171
24°F242234228224218214210205199
20°F268259252246241237233227220
16°F296286280273268262256250241

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
5,450
Cooling degree days, base 65°F
791
Growing degree days, base 40°F
5,520
Growing degree days, base 45°F
4,278
Growing degree days, base 50°F
3,185
Growing degree days, base 55°F
2,239
Growing degree days, base 60°F
1,435

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,07108
February90709
March779136
April4239142
May18153347
June35155570
July4255716
August7215673
September8491460
October36612174
November668038
December925013

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 14.9 km from Allison. 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 USC00369050 (Uniontown 1 Ne). Public domain.