Asherton climate

Asherton Frost Dates and Growing Season

NOAA 1991-2020 normals for Carrizo Springs 3S, 12.3 km from Asherton, elevation 613 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Carrizo Springs 3S. 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 5 and the first fall freeze around November 22, a growing season of about 265 days.

Median at 36°F
last March 18, first November 12
Median at 32°F
last March 5, first November 22
Median at 28°F
last February 20, first December 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°FApr 8Apr 2Mar 28Mar 22Mar 18Mar 13Mar 9Mar 3Feb 25
32°FMar 30Mar 20Mar 14Mar 9Mar 5Mar 1Feb 24Feb 19Feb 10
28°FMar 15Mar 8Mar 3Feb 26Feb 20Feb 13Feb 6Jan 30Jan 19
24°FMar 6Feb 26Feb 14Feb 5Jan 30Jan 22Jan 14Jan 6Dec 27
20°FFeb 24Feb 6Jan 30Jan 20Jan 11Jan 7Jan 1Dec 24Dec 18
16°FFeb 8Jan 21Jan 15Jan 8Jan 5Jan 1Dec 28Dec 23Dec 18

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 29Nov 3Nov 6Nov 9Nov 12Nov 15Nov 18Nov 23Nov 30
32°FNov 6Nov 12Nov 16Nov 19Nov 22Nov 27Dec 1Dec 5Dec 11
28°FNov 16Nov 22Nov 28Dec 1Dec 5Dec 9Dec 15Dec 24Jan 3
24°FNov 27Dec 4Dec 9Dec 16Dec 22Dec 30Jan 3Jan 11Feb 1
20°FDec 7Dec 17Dec 22Dec 29Jan 2Jan 8Jan 15Jan 30Feb 10
16°FDec 17Dec 21Dec 26Dec 31Jan 2Jan 7Jan 12Jan 19Feb 5

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°F267258251246241236229224215
32°F295283275270265259254246236
28°F330317307300292283277269259
24°F365355345336330321311301288
20°F365365365365365358349338318
16°F365365365365365365365365361

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
88% of years
20°F or colder
50% of years
16°F or colder
13% 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
1,414
Cooling degree days, base 65°F
3,494
Growing degree days, base 40°F
11,225
Growing degree days, base 45°F
9,452
Growing degree days, base 50°F
7,759
Growing degree days, base 55°F
6,191
Growing degree days, base 60°F
4,765

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January4107138
February25623223
March12794444
April25226651
May2433896
June05891,039
July06531,118
August06731,138
September1475924
October32252686
November17760349
December3849153

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 12.3 km from Asherton. 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 USC00411486 (Carrizo Springs 3S). Public domain.