Greene County climate

Greene County Frost Dates and Growing Season

NOAA 1991-2020 normals for Snow Hill Waste Water Treament, 3.4 km from Greene County, elevation 41 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Snow Hill Waste Water Treament. 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 26 and the first fall freeze around November 12, a growing season of about 232 days.

Median at 36°F
last April 6, first November 2
Median at 32°F
last March 26, first November 12
Median at 28°F
last March 9, first November 24

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 15Apr 11Apr 8Apr 6Apr 3Mar 31Mar 28Mar 21
32°FApr 8Apr 4Apr 1Mar 29Mar 26Mar 22Mar 18Mar 12Mar 4
28°FMar 29Mar 23Mar 19Mar 14Mar 9Mar 5Mar 1Feb 26Feb 20
24°FMar 18Mar 10Mar 5Mar 1Feb 27Feb 23Feb 17Feb 9Feb 2
20°FMar 5Feb 27Feb 22Feb 14Feb 7Feb 2Jan 29Jan 21Jan 11
16°FFeb 23Feb 12Feb 4Jan 31Jan 26Jan 21Jan 16Jan 11Jan 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 22Oct 26Oct 29Nov 1Nov 2Nov 5Nov 7Nov 11Nov 16
32°FNov 1Nov 4Nov 6Nov 10Nov 12Nov 15Nov 18Nov 23Nov 30
28°FNov 8Nov 12Nov 16Nov 20Nov 24Nov 28Dec 2Dec 7Dec 19
24°FNov 18Nov 25Nov 30Dec 4Dec 10Dec 18Dec 25Jan 1Jan 6
20°FDec 2Dec 12Dec 22Dec 28Jan 1Jan 6Jan 10Jan 17Jan 28
16°FDec 21Dec 28Jan 1Jan 7Jan 11Jan 16Jan 20Jan 27Feb 7

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°F232223219214210206202198192
32°F257248242237232228223218211
28°F287277270263258252246241232
24°F317306299293288281275267257
20°F355340332326319311305300289
16°F365365365355348339334325315

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
94% of years
16°F or colder
68% 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
3,014
Cooling degree days, base 65°F
1,841
Growing degree days, base 40°F
8,157
Growing degree days, base 45°F
6,578
Growing degree days, base 50°F
5,151
Growing degree days, base 55°F
3,883
Growing degree days, base 60°F
2,782

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January698042
February557263
March42013152
April17150342
May39178605
June2360808
July0491956
August0422887
September8251693
October13366403
November3836139
December606161

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 3.4 km from Greene 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 USC00318066 (Snow Hill Waste Water Treament). Public domain.