Wisner climate

Wisner Frost Dates and Growing Season

NOAA 1991-2020 normals for Stanton 7NE, 22.4 km from Wisner, elevation 1580 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Stanton 7NE. 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 7, a growing season of about 160 days.

Median at 36°F
last May 8, first September 30
Median at 32°F
last April 30, first October 7
Median at 28°F
last April 19, first October 18

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 22May 17May 13May 11May 8May 6May 4May 1Apr 26
32°FMay 12May 8May 5May 2Apr 30Apr 27Apr 23Apr 19Apr 14
28°FMay 4Apr 30Apr 25Apr 22Apr 19Apr 16Apr 13Apr 9Apr 5
24°FApr 22Apr 18Apr 15Apr 11Apr 8Apr 6Apr 3Apr 1Mar 25
20°FApr 15Apr 10Apr 6Apr 3Apr 1Mar 29Mar 24Mar 20Mar 14
16°FApr 7Apr 1Mar 30Mar 26Mar 21Mar 18Mar 14Mar 10Mar 5

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 16Sep 21Sep 24Sep 27Sep 30Oct 1Oct 4Oct 7Oct 11
32°FSep 24Sep 29Oct 1Oct 4Oct 7Oct 10Oct 14Oct 17Oct 21
28°FOct 1Oct 6Oct 11Oct 15Oct 18Oct 21Oct 24Oct 28Nov 1
24°FOct 16Oct 21Oct 24Oct 27Oct 30Nov 1Nov 3Nov 6Nov 11
20°FOct 25Oct 30Nov 1Nov 4Nov 6Nov 9Nov 11Nov 16Nov 23
16°FNov 1Nov 5Nov 8Nov 11Nov 14Nov 17Nov 21Nov 25Dec 1

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°F161155150146142139136130124
32°F180173168164160157153148142
28°F201194189185182177173166160
24°F222214210205201198194190183
20°F243235229224220215211206199
16°F260252246241236231227222216

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
6,802
Cooling degree days, base 65°F
793
Growing degree days, base 40°F
5,067
Growing degree days, base 45°F
3,961
Growing degree days, base 50°F
2,981
Growing degree days, base 55°F
2,120
Growing degree days, base 60°F
1,390

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,35901
February1,11401
March892123
April514496
May22446310
June30174594
July7277734
August14206657
September12177412
October4488137
November848016
December1,23100

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 22.4 km from Wisner. 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 USC00258117 (Stanton 7NE). Public domain.