Duplin County climate

Duplin County Frost Dates and Growing Season

NOAA 1991-2020 normals for Warsaw 5 E, 10.7 km from Duplin County, elevation 110 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Warsaw 5 E. 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 7 and the first fall freeze around October 30, a growing season of about 204 days.

Median at 36°F
last April 20, first October 22
Median at 32°F
last April 7, first October 30
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 6Apr 30Apr 27Apr 23Apr 20Apr 17Apr 15Apr 11Apr 6
32°FApr 22Apr 17Apr 13Apr 10Apr 7Apr 4Apr 1Mar 29Mar 23
28°FApr 13Apr 7Apr 3Mar 31Mar 29Mar 25Mar 21Mar 17Mar 9
24°FApr 3Mar 29Mar 24Mar 20Mar 16Mar 12Mar 7Feb 28Feb 21
20°FMar 22Mar 16Mar 11Mar 4Feb 28Feb 24Feb 16Feb 9Jan 31
16°FMar 8Mar 1Feb 22Feb 12Feb 4Jan 31Jan 25Jan 17Jan 6

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 8Oct 13Oct 16Oct 19Oct 22Oct 24Oct 27Oct 30Nov 2
32°FOct 16Oct 21Oct 24Oct 27Oct 30Nov 1Nov 3Nov 6Nov 11
28°FOct 25Oct 30Nov 2Nov 4Nov 7Nov 11Nov 14Nov 19Nov 25
24°FNov 3Nov 7Nov 11Nov 16Nov 20Nov 25Nov 30Dec 4Dec 12
20°FNov 12Nov 19Nov 25Dec 1Dec 6Dec 12Dec 19Dec 28Jan 6
16°FNov 28Dec 8Dec 15Dec 22Dec 29Jan 2Jan 8Jan 15Jan 26

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°F203196192188184180175170164
32°F226219213209204201197192187
28°F253243237232228222217211204
24°F286273264256251246241234225
20°F321308300293286278272262252
16°F360346335330323313306298285

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
93% 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
3,489
Cooling degree days, base 65°F
1,419
Growing degree days, base 40°F
7,357
Growing degree days, base 45°F
5,849
Growing degree days, base 50°F
4,498
Growing degree days, base 55°F
3,306
Growing degree days, base 60°F
2,280

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January758031
February618137
March4834117
April23130276
May70115511
June7277720
July0402866
August0344809
September20198628
October19041332
November4486120
December663150

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 10.7 km from Duplin County. 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 USC00319081 (Warsaw 5 E). Public domain.