Edna climate

Edna Frost Dates and Growing Season

NOAA 1991-2020 normals for Victoria Rgnl AP, 30.7 km from Edna, elevation 104 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Victoria Rgnl AP. 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 February 4 and the first fall freeze around December 9, a growing season of about 309 days.

Median at 36°F
last February 26, first November 26
Median at 32°F
last February 4, first December 9
Median at 28°F
last January 20, first January 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°FMar 18Mar 10Mar 6Mar 2Feb 26Feb 21Feb 15Feb 5Jan 28
32°FMar 5Feb 26Feb 19Feb 11Feb 4Jan 29Jan 23Jan 15Dec 30
28°FFeb 21Feb 10Feb 2Jan 27Jan 20Jan 12Jan 5Dec 29Dec 14
24°FFeb 10Feb 1Jan 25Jan 20Jan 11Jan 5Jan 1Dec 26Dec 17
20°F–––––––––
16°F–––––––––

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°FNov 7Nov 13Nov 18Nov 23Nov 26Nov 30Dec 4Dec 9Dec 19
32°FNov 18Nov 25Nov 30Dec 4Dec 9Dec 17Dec 25Jan 2Jan 13
28°FDec 1Dec 8Dec 16Dec 25Jan 1Jan 4Jan 10Jan 19Feb 2
24°FDec 15Dec 20Dec 28Jan 1Jan 5Jan 9Jan 19Jan 26Feb 7
20°F–––––––––
16°F–––––––––

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°F311299289283275269263256244
32°F348335327318309303294284272
28°F365365364355346338331321308
24°F365365365365365365365359340
20°F365365365365365365365365365
16°F365365365365365365365365365

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
97% of years
28°F or colder
70% of years
24°F or colder
28% of years
20°F or colder
3% of years
16°F or colder
0% 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
1,093
Cooling degree days, base 65°F
3,315
Growing degree days, base 40°F
11,359
Growing degree days, base 45°F
9,568
Growing degree days, base 50°F
7,832
Growing degree days, base 55°F
6,189
Growing degree days, base 60°F
4,672

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January33519205
February20735274
March10288457
April23188616
May1384848
June0529979
July05971,062
August06151,080
September0476925
October20272718
November12685420
December27927248

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 30.7 km from Edna. 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 USC00419367 (Victoria Rgnl AP). Public domain.