Tyrrell County climate

Tyrrell County Frost Dates and Growing Season

NOAA 1991-2020 normals for Columbia Ag Gum Neck, 18.1 km from Tyrrell County, elevation 10 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Columbia Ag Gum Neck. 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 29 and the first fall freeze around November 13, a growing season of about 231 days.

Median at 36°F
last April 9, first November 3
Median at 32°F
last March 29, first November 13
Median at 28°F
last March 13, first November 30

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 21Apr 17Apr 14Apr 12Apr 9Apr 6Apr 4Apr 1Mar 26
32°FApr 10Apr 5Apr 3Mar 31Mar 29Mar 25Mar 21Mar 17Mar 11
28°FMar 31Mar 26Mar 20Mar 17Mar 13Mar 10Mar 6Mar 2Feb 26
24°FMar 18Mar 12Mar 7Mar 4Feb 28Feb 26Feb 22Feb 15Feb 6
20°FMar 5Feb 28Feb 24Feb 19Feb 14Feb 8Feb 5Jan 31Jan 19
16°FFeb 23Feb 15Feb 8Feb 3Jan 31Jan 28Jan 20Jan 13Jan 4

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 20Oct 25Oct 29Nov 1Nov 3Nov 5Nov 7Nov 12Nov 19
32°FOct 31Nov 3Nov 7Nov 11Nov 13Nov 17Nov 22Nov 27Dec 2
28°FNov 10Nov 16Nov 20Nov 25Nov 30Dec 2Dec 6Dec 14Dec 25
24°FNov 24Dec 1Dec 5Dec 12Dec 19Dec 27Jan 1Jan 6Jan 16
20°FDec 10Dec 21Dec 29Jan 2Jan 7Jan 12Jan 17Jan 26Feb 3
16°FDec 23Jan 1Jan 6Jan 12Jan 17Jan 22Jan 29Feb 3Feb 12

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°F228220216212207204200195189
32°F255246240236231226221217211
28°F289278272265260255250243234
24°F317308302296290284278272262
20°F354335328322314309305300289
16°F365365365359347337331322312

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
93% 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
3,125
Cooling degree days, base 65°F
1,619
Growing degree days, base 40°F
7,842
Growing degree days, base 45°F
6,270
Growing degree days, base 50°F
4,853
Growing degree days, base 55°F
3,604
Growing degree days, base 60°F
2,527

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January691145
February602147
March4686118
April21934286
May52147560
June4299746
July0437902
August0386851
September11229667
October13465401
November36710153
December578377

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 18.1 km from Tyrrell County. 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 USC00311949 (Columbia Ag Gum Neck). Public domain.