Eolia climate

Eolia Frost Dates and Growing Season

NOAA 1991-2020 normals for Clarksville L&d 24, 17.6 km from Eolia, elevation 460 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Clarksville L&d 24. 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 4 and the first fall freeze around November 1, a growing season of about 208 days.

Median at 36°F
last April 16, first October 23
Median at 32°F
last April 4, first November 1
Median at 28°F
last March 24, first November 11

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 3Apr 27Apr 24Apr 20Apr 16Apr 12Apr 9Apr 6Apr 2
32°FApr 23Apr 15Apr 10Apr 7Apr 4Apr 1Mar 30Mar 26Mar 20
28°FApr 8Apr 3Mar 31Mar 28Mar 24Mar 22Mar 18Mar 15Mar 9
24°FMar 31Mar 27Mar 22Mar 18Mar 15Mar 12Mar 9Mar 5Feb 28
20°FMar 23Mar 17Mar 13Mar 10Mar 7Mar 4Mar 2Feb 27Feb 20
16°FMar 15Mar 11Mar 6Mar 3Feb 28Feb 26Feb 21Feb 16Feb 8

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 15Oct 18Oct 20Oct 23Oct 25Oct 27Oct 30Nov 2
32°FOct 19Oct 24Oct 27Oct 30Nov 1Nov 2Nov 5Nov 9Nov 15
28°FOct 30Nov 1Nov 4Nov 7Nov 11Nov 13Nov 16Nov 21Nov 26
24°FNov 5Nov 10Nov 13Nov 16Nov 20Nov 23Nov 27Dec 1Dec 6
20°FNov 12Nov 17Nov 21Nov 26Nov 29Dec 2Dec 5Dec 10Dec 15
16°FNov 20Nov 27Dec 1Dec 5Dec 8Dec 12Dec 17Dec 22Dec 27

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°F207201197192188183179174167
32°F230223217212208205201196189
28°F250243239234229225220216210
24°F270263257253249244240235227
20°F289281276271266261256251245
16°F309300294288284279273267259

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
100% 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
5,166
Cooling degree days, base 65°F
1,324
Growing degree days, base 40°F
6,360
Growing degree days, base 45°F
5,091
Growing degree days, base 50°F
3,955
Growing degree days, base 55°F
2,950
Growing degree days, base 60°F
2,070

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,14402
February91106
March695251
April33517192
May11395449
June10275715
July1399863
August2350814
September47159563
October28427245
November637150
December98905

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 17.6 km from Eolia. 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 USC00231640 (Clarksville L&d 24). Public domain.