Millen climate

Millen Frost Dates and Growing Season

NOAA 1991-2020 normals for Midville Exp Stn, 26.1 km from Millen, elevation 280 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Midville Exp Stn. 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 18 and the first fall freeze around November 11, a growing season of about 237 days.

Median at 36°F
last April 1, first November 1
Median at 32°F
last March 18, first November 11
Median at 28°F
last March 4, first November 26

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 16Apr 11Apr 7Apr 4Apr 1Mar 28Mar 24Mar 18Mar 12
32°FApr 4Mar 30Mar 26Mar 22Mar 18Mar 15Mar 10Mar 5Feb 27
28°FMar 24Mar 19Mar 14Mar 8Mar 4Feb 28Feb 23Feb 18Feb 10
24°FMar 14Mar 5Feb 28Feb 22Feb 15Feb 10Feb 4Jan 31Jan 22
20°FMar 1Feb 17Feb 9Feb 4Jan 31Jan 27Jan 21Jan 13Jan 2
16°FFeb 17Feb 6Jan 31Jan 28Jan 22Jan 18Jan 13Jan 8Dec 30

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 24Oct 27Oct 30Nov 1Nov 3Nov 6Nov 10Nov 15
32°FOct 28Nov 1Nov 5Nov 8Nov 11Nov 15Nov 19Nov 23Dec 1
28°FNov 7Nov 12Nov 17Nov 21Nov 26Nov 30Dec 4Dec 10Dec 23
24°FNov 18Nov 26Dec 1Dec 6Dec 13Dec 21Dec 29Jan 3Jan 13
20°FDec 1Dec 9Dec 20Dec 29Jan 3Jan 9Jan 14Jan 20Jan 30
16°FDec 13Dec 26Jan 2Jan 8Jan 13Jan 17Jan 23Jan 30Feb 4

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°F237228224219214210206199193
32°F263255248242237232227222215
28°F297286279272266260254247237
24°F336323313305299292285276261
20°F365360348338332325318308299
16°F365365365365365357345335322

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
99% of years
20°F or colder
86% of years
16°F or colder
47% 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
2,422
Cooling degree days, base 65°F
2,085
Growing degree days, base 40°F
8,879
Growing degree days, base 45°F
7,209
Growing degree days, base 50°F
5,681
Growing degree days, base 55°F
4,313
Growing degree days, base 60°F
3,109

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January596165
February448284
March30414220
April11266407
May17228676
June0401850
July0499964
August0467932
September4304750
October9689461
November32213186
December522387

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 26.1 km from Millen. 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 USC00095863 (Midville Exp Stn). Public domain.