Sangaree climate

Sangaree Frost Dates and Growing Season

NOAA 1991-2020 normals for Summerville 4W, 9.7 km from Sangaree, elevation 65 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Summerville 4W. 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 22 and the first fall freeze around November 12, a growing season of about 238 days.

Median at 36°F
last April 3, first November 3
Median at 32°F
last March 22, first November 12
Median at 28°F
last March 7, first November 29

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 19Apr 13Apr 10Apr 6Apr 3Mar 31Mar 27Mar 23Mar 16
32°FApr 7Apr 2Mar 29Mar 26Mar 22Mar 18Mar 14Mar 9Mar 1
28°FMar 28Mar 22Mar 17Mar 12Mar 7Mar 3Feb 27Feb 21Feb 10
24°FMar 17Mar 8Mar 2Feb 26Feb 17Feb 11Feb 4Jan 30Jan 19
20°FMar 5Feb 25Feb 14Feb 5Jan 31Jan 26Jan 20Jan 12Dec 31
16°FFeb 18Feb 7Jan 31Jan 28Jan 23Jan 18Jan 14Jan 6Jan 1

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 19Oct 24Oct 28Oct 31Nov 3Nov 5Nov 9Nov 13Nov 18
32°FOct 29Nov 2Nov 6Nov 9Nov 12Nov 16Nov 20Nov 26Dec 3
28°FNov 7Nov 13Nov 19Nov 24Nov 29Dec 2Dec 6Dec 15Dec 28
24°FNov 23Dec 1Dec 5Dec 11Dec 19Dec 28Jan 1Jan 7Jan 20
20°FDec 7Dec 17Dec 27Jan 1Jan 6Jan 11Jan 17Jan 25Feb 8
16°FDec 24Jan 1Jan 4Jan 10Jan 14Jan 18Jan 24Jan 31Feb 11

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°F238229223217213209204199192
32°F266256250244238232226220213
28°F301287278271265259252245235
24°F340328317309301294285276265
20°F365365354342334329318308297
16°F365365365365365365355343331

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
98% of years
20°F or colder
82% of years
16°F or colder
40% 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
2,385
Cooling degree days, base 65°F
1,988
Growing degree days, base 40°F
8,807
Growing degree days, base 45°F
7,127
Growing degree days, base 50°F
5,590
Growing degree days, base 55°F
4,213
Growing degree days, base 60°F
3,008

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January579170
February438393
March31314216
April12754381
May20197642
June1367816
July0480945
August0467931
September5297742
October9690462
November31715191
December4894101

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 9.7 km from Sangaree. 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 USC00388426 (Summerville 4W). Public domain.