Winnfield climate

Winnfield Frost Dates and Growing Season

NOAA 1991-2020 normals for Winnfield 3 N, 4.3 km from Winnfield, elevation 160 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Winnfield 3 N. 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 March 13 and the first fall freeze around November 10, a growing season of about 242 days.

Median at 36°F
last March 28, first November 1
Median at 32°F
last March 13, first November 10
Median at 28°F
last February 28, first November 23

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°FApr 16Apr 9Apr 5Apr 1Mar 28Mar 24Mar 19Mar 14Mar 6
32°FApr 5Mar 29Mar 23Mar 18Mar 13Mar 8Mar 3Feb 28Feb 23
28°FMar 20Mar 12Mar 6Mar 2Feb 28Feb 24Feb 20Feb 14Feb 3
24°FMar 6Feb 28Feb 23Feb 17Feb 10Feb 3Jan 30Jan 23Jan 10
20°FFeb 27Feb 15Feb 7Jan 31Jan 27Jan 20Jan 11Jan 3Dec 22
16°FFeb 11Feb 4Jan 31Jan 26Jan 18Jan 11Jan 5Dec 31Dec 24

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 18Oct 23Oct 27Oct 30Nov 1Nov 4Nov 7Nov 10Nov 18
32°FOct 27Nov 1Nov 4Nov 7Nov 10Nov 14Nov 18Nov 23Dec 1
28°FNov 4Nov 8Nov 13Nov 18Nov 23Nov 28Dec 2Dec 7Dec 22
24°FNov 13Nov 20Nov 27Dec 3Dec 8Dec 20Dec 31Jan 4Jan 13
20°FNov 26Dec 5Dec 17Dec 27Jan 1Jan 6Jan 10Jan 16Feb 2
16°FDec 12Dec 24Jan 1Jan 5Jan 8Jan 14Jan 19Jan 29Feb 6

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°F245236229222218213208202193
32°F268259254247242236230223213
28°F303291283275267262255248237
24°F342330320312306297288280266
20°F365365359349341334326315301
16°F365365365365365365362348334

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
97% of years
20°F or colder
74% of years
16°F or colder
35% 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
2,238
Cooling degree days, base 65°F
2,376
Growing degree days, base 40°F
9,350
Growing degree days, base 45°F
7,671
Growing degree days, base 50°F
6,116
Growing degree days, base 55°F
4,711
Growing degree days, base 60°F
3,458

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January575273
February4166110
March23529287
April8899463
May12257710
June0426876
July0530995
August0528993
September4353799
October85125509
November31017204
December512397

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 4.3 km from Winnfield. 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 USC00169803 (Winnfield 3 N). Public domain.