Logan County climate

Logan County Frost Dates and Growing Season

NOAA 1991-2020 normals for Russellville, 1 km from Logan County, elevation 570 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Russellville. 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 9 and the first fall freeze around October 28, a growing season of about 200 days.

Median at 36°F
last April 23, first October 19
Median at 32°F
last April 9, first October 28
Median at 28°F
last March 29, first November 7

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 13May 6May 1Apr 28Apr 23Apr 20Apr 17Apr 12Apr 7
32°FApr 30Apr 23Apr 17Apr 14Apr 9Apr 6Apr 3Mar 31Mar 24
28°FApr 14Apr 8Apr 4Apr 1Mar 29Mar 24Mar 20Mar 16Mar 9
24°FApr 3Mar 28Mar 22Mar 18Mar 14Mar 10Mar 5Mar 1Feb 24
20°FMar 20Mar 14Mar 9Mar 5Mar 1Feb 26Feb 22Feb 15Feb 7
16°FMar 9Mar 2Feb 27Feb 23Feb 17Feb 11Feb 6Feb 1Jan 25

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 5Oct 10Oct 13Oct 16Oct 19Oct 21Oct 24Oct 27Oct 30
32°FOct 14Oct 19Oct 22Oct 25Oct 28Oct 31Nov 2Nov 5Nov 10
28°FOct 26Oct 31Nov 2Nov 4Nov 7Nov 10Nov 13Nov 17Nov 24
24°FNov 4Nov 8Nov 11Nov 15Nov 18Nov 22Nov 26Dec 1Dec 5
20°FNov 12Nov 18Nov 23Nov 27Dec 1Dec 4Dec 8Dec 15Dec 23
16°FNov 24Nov 30Dec 5Dec 10Dec 16Dec 22Dec 28Jan 2Jan 12

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°F199192185181176172167161152
32°F221214209204200195190184176
28°F249239232227223218214209201
24°F272264258253248243236230223
20°F303293285278272266261254246
16°F331321312306300294287279268

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
4,259
Cooling degree days, base 65°F
1,375
Growing degree days, base 40°F
6,858
Growing degree days, base 45°F
5,462
Growing degree days, base 50°F
4,214
Growing degree days, base 55°F
3,118
Growing degree days, base 60°F
2,171

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January928015
February741022
March564587
April27427245
May88121500
June7280723
July0392857
August2346809
September40169579
October24633279
November552276
December817023

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 km from Logan County. 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 USC00157049 (Russellville). Public domain.