Uvalda climate

Uvalda Frost Dates and Growing Season

NOAA 1991-2020 normals for Hazlehurst, 17.9 km from Uvalda, elevation 250 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Hazlehurst. 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 12 and the first fall freeze around November 17, a growing season of about 251 days.

Median at 36°F
last March 24, first November 6
Median at 32°F
last March 12, first November 17
Median at 28°F
last February 24, first December 4

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 10Apr 5Mar 31Mar 28Mar 24Mar 21Mar 17Mar 12Mar 6
32°FMar 28Mar 23Mar 18Mar 15Mar 12Mar 7Mar 3Feb 26Feb 18
28°FMar 18Mar 12Mar 6Mar 2Feb 24Feb 18Feb 13Feb 6Jan 29
24°FMar 5Feb 24Feb 15Feb 8Feb 4Jan 31Jan 24Jan 18Jan 6
20°FFeb 19Feb 8Feb 2Jan 29Jan 23Jan 17Jan 11Jan 4Dec 27
16°FFeb 8Feb 2Jan 28Jan 23Jan 18Jan 12Jan 5Dec 31Dec 20

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 24Oct 29Nov 1Nov 3Nov 6Nov 8Nov 12Nov 16Nov 21
32°FNov 1Nov 6Nov 10Nov 14Nov 17Nov 21Nov 25Dec 1Dec 8
28°FNov 12Nov 19Nov 25Nov 30Dec 4Dec 9Dec 15Dec 24Jan 4
24°FNov 27Dec 5Dec 11Dec 18Dec 24Jan 1Jan 5Jan 13Jan 27
20°FDec 8Dec 18Dec 26Jan 1Jan 5Jan 10Jan 16Jan 25Feb 5
16°FDec 13Dec 25Jan 1Jan 4Jan 12Jan 16Jan 23Jan 30Feb 6

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°F250241237233228223218213205
32°F281272263257251246241233225
28°F321306296289282276269262251
24°F354342334328322314306297284
20°F365365365361351342335329318
16°F365365365365365365365356337

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
93% of years
20°F or colder
64% of years
16°F or colder
26% 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
1,920
Cooling degree days, base 65°F
2,366
Growing degree days, base 40°F
9,617
Growing degree days, base 45°F
7,887
Growing degree days, base 50°F
6,270
Growing degree days, base 55°F
4,799
Growing degree days, base 60°F
3,494

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January4985110
February3597133
March22129293
April8297467
May11268722
June0428877
July0528993
August0502967
September2341789
October67128527
November25025251
December4309140

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 17.9 km from Uvalda. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00094204 (Hazlehurst). Public domain.