Adairsville climate

Adairsville Frost Dates and Growing Season

NOAA 1991-2020 normals for Rome R B Russell AP, 21 km from Adairsville, elevation 639 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Rome R B Russell AP. 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 3, a growing season of about 219 days.

Median at 36°F
last April 11, first October 25
Median at 32°F
last March 29, first November 3
Median at 28°F
last March 16, first November 14

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 28Apr 23Apr 19Apr 15Apr 11Apr 8Apr 4Mar 31Mar 25
32°FApr 15Apr 9Apr 5Apr 1Mar 29Mar 26Mar 21Mar 17Mar 12
28°FApr 3Mar 29Mar 24Mar 19Mar 16Mar 12Mar 7Mar 2Feb 25
24°FMar 23Mar 17Mar 13Mar 7Mar 2Feb 26Feb 20Feb 14Feb 4
20°FMar 12Mar 2Feb 23Feb 16Feb 10Feb 4Jan 31Jan 23Jan 12
16°FFeb 27Feb 14Feb 6Feb 1Jan 28Jan 22Jan 17Jan 9Jan 2

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 12Oct 16Oct 20Oct 22Oct 25Oct 27Oct 30Nov 2Nov 6
32°FOct 22Oct 25Oct 29Nov 1Nov 3Nov 5Nov 9Nov 12Nov 18
28°FOct 30Nov 3Nov 7Nov 10Nov 14Nov 17Nov 22Nov 27Dec 2
24°FNov 9Nov 15Nov 20Nov 25Dec 1Dec 3Dec 8Dec 15Dec 28
20°FNov 23Dec 1Dec 5Dec 12Dec 21Dec 29Jan 3Jan 9Jan 19
16°FDec 9Dec 21Dec 29Jan 2Jan 6Jan 12Jan 18Jan 24Feb 1

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°F216210204200195191187182175
32°F241234228222219214210204197
28°F273263256250245240235227219
24°F307297289281275269263256246
20°F345333325317308302294287275
16°F365365354345338333327318305

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
98% of years
16°F or colder
80% 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
2,974
Cooling degree days, base 65°F
1,838
Growing degree days, base 40°F
8,164
Growing degree days, base 45°F
6,578
Growing degree days, base 50°F
5,145
Growing degree days, base 55°F
3,875
Growing degree days, base 60°F
2,778

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January702039
February525256
March3677166
April15244350
May30171606
June1356805
July0473938
August0448913
September8271712
October14460390
November4156118
December630152

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 21 km from Adairsville. 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 USW00093801 (Rome R B Russell AP). Public domain.