Hohenwald climate

Hohenwald Frost Dates and Growing Season

NOAA 1991-2020 normals for Hohenwald, 1.4 km from Hohenwald, elevation 980 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Hohenwald. 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 5 and the first fall freeze around November 1, a growing season of about 210 days.

Median at 36°F
last April 16, first October 22
Median at 32°F
last April 5, first November 1
Median at 28°F
last March 25, first November 10

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 29Apr 25Apr 20Apr 16Apr 13Apr 10Apr 5Mar 31
32°FApr 23Apr 16Apr 12Apr 8Apr 5Apr 1Mar 30Mar 25Mar 19
28°FApr 10Apr 4Apr 1Mar 29Mar 25Mar 21Mar 18Mar 14Mar 5
24°FMar 31Mar 25Mar 20Mar 16Mar 13Mar 9Mar 4Feb 28Feb 23
20°FMar 20Mar 14Mar 9Mar 5Mar 2Feb 28Feb 23Feb 18Feb 11
16°FMar 9Mar 4Feb 28Feb 24Feb 19Feb 14Feb 8Feb 2Jan 26

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 10Oct 14Oct 17Oct 20Oct 22Oct 24Oct 27Oct 30Nov 3
32°FOct 18Oct 23Oct 26Oct 29Nov 1Nov 3Nov 6Nov 9Nov 16
28°FOct 28Nov 1Nov 4Nov 7Nov 10Nov 14Nov 18Nov 23Nov 28
24°FNov 6Nov 11Nov 15Nov 19Nov 23Nov 27Dec 1Dec 4Dec 12
20°FNov 13Nov 21Nov 26Dec 1Dec 4Dec 8Dec 13Dec 21Dec 29
16°FNov 24Dec 2Dec 8Dec 15Dec 21Dec 27Jan 1Jan 6Jan 16

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°F207201196191187183178173165
32°F233224219214210206201196187
28°F255246240236231226221215209
24°F280271264260255249243237229
20°F305294288283277272266259250
16°F332322314307303296288280272

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
3,762
Cooling degree days, base 65°F
1,404
Growing degree days, base 40°F
7,225
Growing degree days, base 45°F
5,757
Growing degree days, base 50°F
4,430
Growing degree days, base 55°F
3,262
Growing degree days, base 60°F
2,253

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January843023
February665035
March4886120
April22034290
May71119514
June4271717
July0378843
August1364828
September32189608
October19941325
November493296
December747033

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 1.4 km from Hohenwald. 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 USC00404223 (Hohenwald). Public domain.