Coalgate climate

Coalgate Frost Dates and Growing Season

NOAA 1991-2020 normals for Centrahoma 2 Ese, 11.1 km from Coalgate, elevation 710 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Centrahoma 2 Ese. 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 31 and the first fall freeze around November 4, a growing season of about 219 days.

Median at 36°F
last April 11, first October 27
Median at 32°F
last March 31, first November 4
Median at 28°F
last March 16, first November 14

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 28Apr 22Apr 19Apr 15Apr 11Apr 8Apr 5Apr 1Mar 26
32°FApr 18Apr 10Apr 7Apr 4Mar 31Mar 28Mar 23Mar 17Mar 9
28°FApr 4Mar 30Mar 25Mar 20Mar 16Mar 12Mar 8Mar 3Feb 26
24°FMar 24Mar 16Mar 12Mar 8Mar 3Feb 28Feb 26Feb 20Feb 12
20°FMar 13Mar 7Mar 2Feb 27Feb 21Feb 16Feb 10Feb 2Jan 25
16°FMar 4Feb 25Feb 18Feb 11Feb 4Jan 31Jan 26Jan 19Jan 6

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 15Oct 19Oct 22Oct 25Oct 27Oct 30Nov 1Nov 5Nov 9
32°FOct 22Oct 27Oct 31Nov 2Nov 4Nov 7Nov 11Nov 15Nov 21
28°FOct 30Nov 3Nov 8Nov 11Nov 14Nov 18Nov 21Nov 27Dec 2
24°FNov 8Nov 13Nov 19Nov 23Nov 27Dec 1Dec 4Dec 8Dec 16
20°FNov 18Nov 26Nov 30Dec 5Dec 9Dec 14Dec 20Dec 26Jan 2
16°FNov 30Dec 8Dec 13Dec 20Dec 26Jan 1Jan 5Jan 14Jan 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°F218211205202198194189184178
32°F241234228224219213209204198
28°F269260253247242237232224216
24°F293282276271265260255247237
20°F324311305298292286280272263
16°F355343335328321313306300288

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
93% 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
3,334
Cooling degree days, base 65°F
1,933
Growing degree days, base 40°F
8,069
Growing degree days, base 45°F
6,546
Growing degree days, base 50°F
5,164
Growing degree days, base 55°F
3,933
Growing degree days, base 60°F
2,855

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January795123
February594255
March41010158
April18642325
May44152574
June1356805
July0507972
August0500965
September14279715
October15475397
November4228138
December715137

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 11.1 km from Coalgate. 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 USC00341648 (Centrahoma 2 Ese). Public domain.