Winfield climate

Winfield Frost Dates and Growing Season

NOAA 1991-2020 normals for Winfield 3NE, 7.3 km from Winfield, elevation 1233 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Winfield 3NE. 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 16 and the first fall freeze around October 22, a growing season of about 189 days.

Median at 36°F
last April 26, first October 13
Median at 32°F
last April 16, first October 22
Median at 28°F
last April 3, first November 1

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 8May 4May 1Apr 29Apr 26Apr 23Apr 20Apr 15Apr 9
32°FMay 1Apr 27Apr 23Apr 20Apr 16Apr 12Apr 8Apr 3Mar 31
28°FApr 22Apr 15Apr 11Apr 7Apr 3Apr 1Mar 29Mar 25Mar 17
24°FApr 10Apr 4Apr 1Mar 29Mar 25Mar 21Mar 16Mar 12Mar 6
20°FApr 1Mar 27Mar 21Mar 16Mar 13Mar 9Mar 6Mar 2Feb 25
16°FMar 20Mar 14Mar 10Mar 6Mar 3Feb 28Feb 25Feb 20Feb 15

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 29Oct 3Oct 6Oct 10Oct 13Oct 16Oct 18Oct 21Oct 25
32°FOct 7Oct 13Oct 17Oct 19Oct 22Oct 25Oct 27Oct 30Nov 3
28°FOct 19Oct 23Oct 27Oct 29Nov 1Nov 2Nov 5Nov 9Nov 15
24°FOct 26Oct 30Nov 2Nov 5Nov 8Nov 11Nov 16Nov 20Nov 26
20°FNov 1Nov 6Nov 10Nov 14Nov 18Nov 21Nov 25Nov 30Dec 5
16°FNov 9Nov 15Nov 20Nov 24Nov 28Dec 2Dec 5Dec 11Dec 16

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°F188182177173170166162157150
32°F210202198193189185180175167
28°F231223218213209205201195187
24°F254246239234229225220214206
20°F274265259254249245239234225
16°F294286279274269264259253246

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
4,658
Cooling degree days, base 65°F
1,514
Growing degree days, base 40°F
6,803
Growing degree days, base 45°F
5,466
Growing degree days, base 50°F
4,270
Growing degree days, base 55°F
3,214
Growing degree days, base 60°F
2,298

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,01704
February801015
March592381
April30720216
May99106474
June6294738
July0454919
August1407871
September44194601
October25835279
November596266
December93707

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 7.3 km from Winfield. 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 USC00148964 (Winfield 3NE). Public domain.