Gruver climate

Gruver Frost Dates and Growing Season

NOAA 1991-2020 normals for Gruver, 0.2 km from Gruver, elevation 3170 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Gruver. 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 21 and the first fall freeze around October 23, a growing season of about 182 days.

Median at 36°F
last April 30, first October 13
Median at 32°F
last April 21, first October 23
Median at 28°F
last April 10, 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 13May 8May 4May 2Apr 30Apr 28Apr 25Apr 21Apr 17
32°FMay 4Apr 30Apr 27Apr 24Apr 21Apr 18Apr 15Apr 12Apr 7
28°FApr 27Apr 21Apr 17Apr 14Apr 10Apr 7Apr 4Apr 1Mar 26
24°FApr 17Apr 11Apr 7Apr 3Mar 31Mar 28Mar 24Mar 18Mar 11
20°FApr 6Apr 1Mar 27Mar 22Mar 17Mar 13Mar 9Mar 5Feb 28
16°FMar 24Mar 16Mar 11Mar 7Mar 4Mar 1Feb 26Feb 21Feb 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 7Oct 10Oct 13Oct 16Oct 19Oct 21Oct 25
32°FOct 8Oct 14Oct 17Oct 20Oct 23Oct 25Oct 28Oct 31Nov 3
28°FOct 19Oct 23Oct 27Oct 29Nov 1Nov 3Nov 5Nov 8Nov 13
24°FOct 27Nov 1Nov 3Nov 6Nov 8Nov 11Nov 13Nov 17Nov 22
20°FNov 1Nov 7Nov 10Nov 13Nov 16Nov 19Nov 22Nov 27Dec 2
16°FNov 9Nov 14Nov 18Nov 22Nov 25Nov 29Dec 2Dec 6Dec 12

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°F181175171167165160156152146
32°F201195190186182179175170163
28°F222215211206203199195189182
24°F243236231226222217213208200
20°F266259253247243238233226218
16°F291282275270265260255248238

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
4,574
Cooling degree days, base 65°F
1,439
Growing degree days, base 40°F
6,708
Growing degree days, base 45°F
5,352
Growing degree days, base 50°F
4,152
Growing degree days, base 55°F
3,106
Growing degree days, base 60°F
2,205

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January94203
February763013
March585274
April32713200
May109101464
June9295737
July2437900
August2383846
September45180587
October27027263
November601160
December92105

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 0.2 km from Gruver. 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 USC00413787 (Gruver). Public domain.