Uvalde County climate

Uvalde County Frost Dates and Growing Season

NOAA 1991-2020 normals for Camp Wood, 42.3 km from Uvalde County, elevation 1480 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Camp Wood. 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 14, a growing season of about 248 days.

Median at 36°F
last March 27, first November 5
Median at 32°F
last March 12, first November 14
Median at 28°F
last March 1, first November 27

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 12Apr 6Apr 3Mar 30Mar 27Mar 23Mar 19Mar 14Mar 7
32°FApr 2Mar 27Mar 22Mar 17Mar 12Mar 8Mar 3Feb 28Feb 20
28°FMar 24Mar 15Mar 9Mar 5Mar 1Feb 25Feb 17Feb 9Feb 1
24°FMar 9Mar 2Feb 24Feb 16Feb 8Feb 2Jan 27Jan 19Jan 6
20°FMar 1Feb 16Feb 3Jan 28Jan 21Jan 14Jan 6Dec 30Dec 17
16°FFeb 13Jan 31Jan 19Jan 12Jan 6Jan 2Dec 31Dec 26Dec 16

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 23Oct 28Oct 31Nov 2Nov 5Nov 8Nov 13Nov 16Nov 23
32°FOct 30Nov 3Nov 7Nov 11Nov 14Nov 18Nov 23Dec 1Dec 6
28°FNov 6Nov 13Nov 19Nov 23Nov 27Dec 1Dec 5Dec 11Dec 21
24°FNov 19Nov 26Dec 1Dec 7Dec 12Dec 19Dec 24Jan 1Jan 11
20°FDec 1Dec 9Dec 15Dec 23Dec 27Jan 1Jan 7Jan 16Feb 1
16°FDec 10Dec 16Dec 25Dec 30Jan 1Jan 4Jan 9Jan 17Feb 4

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°F250242236229224219213208199
32°F275265258253248243236229220
28°F310296287279272266259252241
24°F345332324316307298290282269
20°F365365361353345337330318301
16°F365365365365365365363350336

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
98% of years
20°F or colder
75% of years
16°F or colder
35% 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
1,888
Cooling degree days, base 65°F
2,599
Growing degree days, base 40°F
9,880
Growing degree days, base 45°F
8,141
Growing degree days, base 50°F
6,513
Growing degree days, base 55°F
5,040
Growing degree days, base 60°F
3,733

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January510177
February3427142
March19740327
April67123508
May7305763
June0465915
July05441,009
August05501,015
September3377823
October51160575
November24524258
December4663101

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 42.3 km from Uvalde County. 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 USC00411398 (Camp Wood). Public domain.