Carrollton climate

Carrollton Frost Dates and Growing Season

NOAA 1991-2020 normals for Greenwood Leflore AP, 15.5 km from Carrollton, elevation 133 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Greenwood Leflore AP. 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 March 17 and the first fall freeze around November 5, a growing season of about 231 days.

Median at 36°F
last April 1, first October 27
Median at 32°F
last March 17, first November 5
Median at 28°F
last March 3, first November 18

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°FApr 18Apr 11Apr 8Apr 4Apr 1Mar 28Mar 24Mar 19Mar 12
32°FApr 5Mar 31Mar 26Mar 21Mar 17Mar 14Mar 9Mar 4Feb 26
28°FMar 22Mar 16Mar 12Mar 8Mar 3Feb 28Feb 24Feb 19Feb 12
24°FMar 11Mar 4Feb 28Feb 23Feb 18Feb 12Feb 6Jan 31Jan 22
20°FMar 1Feb 20Feb 10Feb 4Jan 31Jan 27Jan 20Jan 13Jan 3
16°FFeb 11Feb 3Jan 31Jan 26Jan 21Jan 17Jan 12Jan 6Dec 27

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 14Oct 18Oct 22Oct 24Oct 27Oct 30Nov 1Nov 4Nov 9
32°FOct 23Oct 28Nov 1Nov 3Nov 5Nov 9Nov 13Nov 17Nov 23
28°FNov 1Nov 6Nov 10Nov 14Nov 18Nov 22Nov 27Dec 1Dec 8
24°FNov 11Nov 19Nov 24Nov 29Dec 3Dec 8Dec 16Dec 27Jan 4
20°FNov 25Dec 5Dec 14Dec 22Dec 29Jan 3Jan 8Jan 15Jan 24
16°FDec 12Dec 24Dec 31Jan 4Jan 8Jan 13Jan 18Jan 23Feb 2

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°F230223217213208204199193186
32°F259249243237231226220215208
28°F289277271265259253247242233
24°F327316307299291284276268258
20°F364351341334327320311304292
16°F365365365365356348340332319

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
91% of years
16°F or colder
63% 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
2,573
Cooling degree days, base 65°F
2,243
Growing degree days, base 40°F
8,952
Growing degree days, base 45°F
7,329
Growing degree days, base 50°F
5,840
Growing degree days, base 55°F
4,489
Growing degree days, base 60°F
3,284

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January640368
February471596
March29824240
April11282425
May17243691
June0418868
July0513978
August0501966
September8324766
October112108467
November35317184
December563692

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 15.5 km from Carrollton. 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 USW00013978 (Greenwood Leflore AP). Public domain.