Winner climate

Winner Frost Dates and Growing Season

NOAA 1991-2020 normals for Winner, 1.8 km from Winner, elevation 2016 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Winner. 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 May 1 and the first fall freeze around October 9, a growing season of about 159 days.

Median at 36°F
last May 11, first October 1
Median at 32°F
last May 1, first October 9
Median at 28°F
last April 22, 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 25May 20May 17May 14May 11May 7May 4May 2Apr 27
32°FMay 16May 11May 7May 4May 1Apr 30Apr 26Apr 22Apr 17
28°FMay 7May 2Apr 29Apr 25Apr 22Apr 19Apr 16Apr 12Apr 7
24°FApr 27Apr 23Apr 18Apr 15Apr 12Apr 8Apr 5Apr 2Mar 28
20°FApr 19Apr 13Apr 9Apr 6Apr 3Mar 31Mar 28Mar 23Mar 16
16°FApr 12Apr 5Apr 2Mar 30Mar 27Mar 23Mar 18Mar 13Mar 7

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 18Sep 22Sep 26Sep 28Oct 1Oct 3Oct 6Oct 9Oct 14
32°FSep 25Sep 30Oct 2Oct 6Oct 9Oct 12Oct 15Oct 18Oct 23
28°FOct 2Oct 7Oct 11Oct 15Oct 18Oct 21Oct 24Oct 29Nov 1
24°FOct 11Oct 16Oct 21Oct 25Oct 28Oct 31Nov 3Nov 7Nov 12
20°FOct 20Oct 26Oct 30Nov 2Nov 5Nov 8Nov 12Nov 15Nov 21
16°FOct 29Nov 2Nov 6Nov 10Nov 13Nov 16Nov 20Nov 24Nov 28

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°F160153149145141138134129123
32°F178171167163159155150146139
28°F199192186181177172167162155
24°F219212206201197192187181174
20°F237230225220215210206200192
16°F255247241235231226221215207

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
6,544
Cooling degree days, base 65°F
997
Growing degree days, base 40°F
5,389
Growing degree days, base 45°F
4,253
Growing degree days, base 50°F
3,247
Growing degree days, base 55°F
2,370
Growing degree days, base 60°F
1,617

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,27601
February1,06104
March868028
April523492
May22543308
June38171584
July2354817
August9292749
September97120478
October43013159
November822026
December1,19301

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 1.8 km from Winner. 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 USC00399367 (Winner). Public domain.