Crump climate

Crump Frost Dates and Growing Season

NOAA 1991-2020 normals for Savannah 6 Sw, 7.7 km from Crump, elevation 420 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Savannah 6 Sw. 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 31 and the first fall freeze around November 1, a growing season of about 212 days.

Median at 36°F
last April 12, first October 23
Median at 32°F
last March 31, first November 1
Median at 28°F
last March 18, first November 11

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

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 23Oct 25Oct 28Oct 31Nov 4
32°FOct 18Oct 22Oct 25Oct 29Nov 1Nov 3Nov 6Nov 10Nov 16
28°FOct 25Oct 31Nov 4Nov 7Nov 11Nov 15Nov 18Nov 23Dec 1
24°FNov 4Nov 10Nov 14Nov 19Nov 23Nov 28Dec 3Dec 8Dec 17
20°FNov 16Nov 24Dec 1Dec 5Dec 10Dec 16Dec 23Dec 31Jan 7
16°FDec 2Dec 9Dec 16Dec 24Dec 30Jan 2Jan 7Jan 15Jan 25

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°F212206201197193189185180174
32°F236227222217212208204199192
28°F265255247242236232226220212
24°F295283276270263257251243234
20°F325314306299292286280272259
16°F356342334327321314307299288

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
94% 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
3,157
Cooling degree days, base 65°F
1,930
Growing degree days, base 40°F
8,184
Growing degree days, base 45°F
6,636
Growing degree days, base 50°F
5,231
Growing degree days, base 55°F
3,976
Growing degree days, base 60°F
2,874

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January754033
February580152
March39613171
April16460360
May34189620
June1371820
July0487952
August0457922
September13268705
October14872399
November4089144
December660152

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 7.7 km from Crump. 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 USC00408108 (Savannah 6 Sw). Public domain.