Maury County climate

Maury County Frost Dates and Growing Season

NOAA 1991-2020 normals for Columbia 3 Wnw, 2.5 km from Maury County, elevation 650 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Columbia 3 Wnw. 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 10 and the first fall freeze around October 27, a growing season of about 199 days.

Median at 36°F
last April 23, first October 18
Median at 32°F
last April 10, first October 27
Median at 28°F
last March 29, first November 5

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 7May 2Apr 30Apr 26Apr 23Apr 21Apr 18Apr 13Apr 8
32°FApr 26Apr 21Apr 17Apr 14Apr 10Apr 7Apr 4Mar 31Mar 26
28°FApr 14Apr 8Apr 4Apr 1Mar 29Mar 25Mar 21Mar 16Mar 8
24°FApr 4Mar 28Mar 23Mar 19Mar 15Mar 11Mar 6Feb 28Feb 23
20°FMar 22Mar 15Mar 9Mar 4Feb 28Feb 25Feb 20Feb 12Feb 4
16°FMar 10Mar 2Feb 26Feb 19Feb 13Feb 7Feb 1Jan 28Jan 18

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 6Oct 11Oct 14Oct 16Oct 18Oct 21Oct 23Oct 25Oct 30
32°FOct 16Oct 19Oct 22Oct 24Oct 27Oct 29Nov 1Nov 3Nov 7
28°FOct 23Oct 28Oct 31Nov 2Nov 5Nov 7Nov 10Nov 15Nov 21
24°FNov 1Nov 5Nov 9Nov 12Nov 16Nov 20Nov 24Nov 29Dec 4
20°FNov 10Nov 16Nov 21Nov 26Nov 30Dec 2Dec 6Dec 13Dec 24
16°FNov 25Dec 1Dec 5Dec 11Dec 17Dec 24Dec 30Jan 4Jan 14

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°F196190185181177173169165158
32°F220212207203199195191186179
28°F246237231226221216212207199
24°F274264258251247241236230222
20°F305293285280274268262254246
16°F336325315308303297289282272

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
99% 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
3,915
Cooling degree days, base 65°F
1,408
Growing degree days, base 40°F
7,089
Growing degree days, base 45°F
5,647
Growing degree days, base 50°F
4,351
Growing degree days, base 55°F
3,213
Growing degree days, base 60°F
2,235

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January856022
February679029
March5084106
April24528262
May77112501
June5277721
July0394859
August1362826
September27195618
October22934293
November524282
December765132

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 2.5 km from Maury 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 USC00401957 (Columbia 3 Wnw). Public domain.