Eva climate

Eva Frost Dates and Growing Season

NOAA 1991-2020 normals for Cullman Nahs, 15.9 km from Eva, elevation 811 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Cullman Nahs. 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 April 7 and the first fall freeze around October 29, a growing season of about 204 days.

Median at 36°F
last April 20, first October 22
Median at 32°F
last April 7, first October 29
Median at 28°F
last March 28, first November 9

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°FMay 4Apr 30Apr 27Apr 23Apr 20Apr 17Apr 14Apr 10Apr 5
32°FApr 22Apr 17Apr 13Apr 10Apr 7Apr 4Apr 2Mar 28Mar 22
28°FApr 12Apr 7Apr 3Mar 31Mar 28Mar 24Mar 19Mar 15Mar 7
24°FApr 1Mar 27Mar 22Mar 17Mar 13Mar 8Mar 4Feb 27Feb 21
20°FMar 18Mar 13Mar 7Mar 3Feb 27Feb 21Feb 15Feb 8Jan 30
16°FMar 8Mar 1Feb 23Feb 15Feb 9Feb 3Jan 30Jan 21Jan 9

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 9Oct 13Oct 16Oct 19Oct 22Oct 23Oct 25Oct 28Nov 1
32°FOct 18Oct 22Oct 25Oct 27Oct 29Nov 1Nov 3Nov 7Nov 12
28°FOct 25Oct 30Nov 2Nov 5Nov 9Nov 12Nov 16Nov 21Nov 28
24°FNov 3Nov 8Nov 13Nov 18Nov 22Nov 27Dec 1Dec 4Dec 14
20°FNov 14Nov 22Nov 28Dec 2Dec 7Dec 13Dec 22Dec 29Jan 7
16°FDec 1Dec 7Dec 15Dec 23Dec 29Jan 1Jan 6Jan 13Jan 25

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°F203196191186182179175170165
32°F225218213209204200196191185
28°F253246238233227222216211204
24°F284274267260255250243237227
20°F322309302293286279273265255
16°F353342333325320311304296283

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
97% 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
3,517
Cooling degree days, base 65°F
1,400
Growing degree days, base 40°F
7,352
Growing degree days, base 45°F
5,850
Growing degree days, base 50°F
4,494
Growing degree days, base 55°F
3,292
Growing degree days, base 60°F
2,264

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January792033
February611142
March4584127
April21926279
May63111514
June3273720
July0380845
August0360824
September21203633
October18939331
November4644102
December697145

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 15.9 km from Eva. 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 USC00012096 (Cullman Nahs). Public domain.