Winnett climate

Winnett Frost Dates and Growing Season

NOAA 1991-2020 normals for Flatwillow 4 Ene, 20.2 km from Winnett, elevation 3292 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Flatwillow 4 Ene. 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 16 and the first fall freeze around September 28, a growing season of about 132 days.

Median at 36°F
last May 29, first September 17
Median at 32°F
last May 16, first September 28
Median at 28°F
last May 3, first October 5

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°FJun 14Jun 7Jun 3May 31May 29May 26May 23May 19May 15
32°FMay 31May 25May 22May 18May 16May 13May 10May 7May 3
28°FMay 17May 12May 9May 6May 3May 1Apr 28Apr 25Apr 21
24°FMay 6May 1Apr 28Apr 25Apr 22Apr 19Apr 16Apr 12Apr 7
20°FApr 29Apr 24Apr 20Apr 16Apr 12Apr 8Apr 5Mar 31Mar 24
16°FApr 20Apr 14Apr 9Apr 4Apr 1Mar 29Mar 24Mar 17Mar 10

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 4Sep 9Sep 12Sep 15Sep 17Sep 20Sep 23Sep 25Sep 30
32°FSep 15Sep 19Sep 23Sep 25Sep 28Sep 30Oct 2Oct 5Oct 10
28°FSep 24Sep 28Oct 1Oct 3Oct 5Oct 9Oct 12Oct 16Oct 20
24°FSep 30Oct 5Oct 9Oct 13Oct 16Oct 19Oct 23Oct 27Nov 2
20°FOct 7Oct 14Oct 19Oct 24Oct 27Oct 31Nov 3Nov 6Nov 13
16°FOct 18Oct 24Oct 29Nov 1Nov 5Nov 8Nov 11Nov 15Nov 20

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°F1291231171141101051029791
32°F151145139136132128124119112
28°F173167161157153150145140133
24°F199191184180176171167162154
20°F221213207201197191185180172
16°F242233227222217212208202192

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
7,169
Cooling degree days, base 65°F
460
Growing degree days, base 40°F
4,249
Growing degree days, base 45°F
3,165
Growing degree days, base 50°F
2,253
Growing degree days, base 55°F
1,500
Growing degree days, base 60°F
897

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,24201
February1,06002
March888011
April606040
May3506171
June11847382
July22191634
August32175608
September19639309
October554284
November900011
December1,20100

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 20.2 km from Winnett. 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 USC00243013 (Flatwillow 4 Ene). Public domain.