Mayesville climate

Mayesville Frost Dates and Growing Season

NOAA 1991-2020 normals for Sumter, 14.9 km from Mayesville, elevation 177 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Sumter. 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 24 and the first fall freeze around November 7, a growing season of about 230 days.

Median at 36°F
last April 3, first October 31
Median at 32°F
last March 24, first November 7
Median at 28°F
last March 13, first November 21

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 20Apr 13Apr 9Apr 6Apr 3Apr 1Mar 29Mar 24Mar 18
32°FApr 7Apr 3Mar 31Mar 28Mar 24Mar 21Mar 18Mar 14Mar 5
28°FMar 30Mar 24Mar 20Mar 17Mar 13Mar 7Mar 2Feb 25Feb 17
24°FMar 20Mar 13Mar 7Mar 3Feb 27Feb 20Feb 10Feb 1Jan 24
20°FMar 7Feb 28Feb 18Feb 10Feb 3Jan 31Jan 25Jan 16Jan 5
16°FFeb 20Feb 7Feb 1Jan 29Jan 24Jan 18Jan 14Jan 7Dec 29

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 17Oct 23Oct 26Oct 28Oct 31Nov 1Nov 3Nov 7Nov 12
32°FOct 28Nov 1Nov 2Nov 5Nov 7Nov 10Nov 14Nov 19Nov 26
28°FNov 4Nov 9Nov 13Nov 17Nov 21Nov 25Dec 1Dec 5Dec 14
24°FNov 17Nov 24Nov 30Dec 3Dec 7Dec 14Dec 23Jan 1Jan 9
20°FNov 30Dec 7Dec 15Dec 25Jan 1Jan 4Jan 9Jan 15Jan 28
16°FDec 14Dec 27Jan 1Jan 5Jan 10Jan 14Jan 21Jan 27Feb 4

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°F229222217213209205200195188
32°F257248242236230225220215209
28°F289277269262257251245238229
24°F325313303295287280273264255
20°F365348338332325316306297286
16°F365365365365359347339333320

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
99% of years
20°F or colder
90% of years
16°F or colder
55% 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
2,821
Cooling degree days, base 65°F
1,796
Growing degree days, base 40°F
8,250
Growing degree days, base 45°F
6,646
Growing degree days, base 50°F
5,189
Growing degree days, base 55°F
3,887
Growing degree days, base 60°F
2,753

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January653154
February512165
March36511183
April14156371
May33172605
June2349798
July0462927
August0417882
September10255694
October13461399
November3868144
December585368

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 14.9 km from Mayesville. 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 USC00388440 (Sumter). Public domain.