Lobelville climate

Lobelville Frost Dates and Growing Season

NOAA 1991-2020 normals for Lobelville, 2.4 km from Lobelville, elevation 445 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Lobelville. 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 13 and the first fall freeze around October 24, a growing season of about 195 days.

Median at 36°F
last April 25, first October 16
Median at 32°F
last April 13, first October 24
Median at 28°F
last April 2, first November 2

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 9May 3Apr 30Apr 28Apr 25Apr 22Apr 19Apr 14Apr 9
32°FApr 28Apr 24Apr 20Apr 16Apr 13Apr 10Apr 6Apr 3Mar 28
28°FApr 17Apr 11Apr 7Apr 4Apr 2Mar 30Mar 26Mar 21Mar 15
24°FApr 4Mar 31Mar 26Mar 22Mar 18Mar 15Mar 11Mar 6Feb 26
20°FMar 23Mar 17Mar 12Mar 7Mar 3Feb 28Feb 24Feb 19Feb 11
16°FMar 13Mar 5Feb 28Feb 23Feb 19Feb 13Feb 7Feb 1Jan 23

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 4Oct 8Oct 10Oct 13Oct 16Oct 19Oct 21Oct 24Oct 28
32°FOct 13Oct 17Oct 20Oct 21Oct 24Oct 26Oct 29Nov 1Nov 5
28°FOct 21Oct 25Oct 29Oct 31Nov 2Nov 5Nov 8Nov 12Nov 17
24°FNov 1Nov 4Nov 7Nov 10Nov 13Nov 16Nov 20Nov 26Dec 3
20°FNov 8Nov 14Nov 17Nov 22Nov 26Dec 1Dec 5Dec 12Dec 25
16°FNov 18Nov 26Dec 2Dec 8Dec 14Dec 23Dec 30Jan 5Jan 15

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°F193186181178174170166160152
32°F216209204199195191187182176
28°F239229223220215212207203195
24°F267257250244240235229224215
20°F301289281274267260254248240
16°F331320312305299292285276264

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
99% 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
3,803
Cooling degree days, base 65°F
1,409
Growing degree days, base 40°F
7,151
Growing degree days, base 45°F
5,689
Growing degree days, base 50°F
4,384
Growing degree days, base 55°F
3,238
Growing degree days, base 60°F
2,248

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January848123
February652134
March4965109
April23730271
May68113511
June5275720
July0400865
August1365829
September27182605
October22337302
November515280
December732136

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 2.4 km from Lobelville. 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 USC00405358 (Lobelville). Public domain.