Acworth climate

Acworth Frost Dates and Growing Season

NOAA 1991-2020 normals for Dallas 7 Ne, 10.1 km from Acworth, elevation 1028 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Dallas 7 Ne. 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 2 and the first fall freeze around November 4, a growing season of about 218 days.

Median at 36°F
last April 16, first October 26
Median at 32°F
last April 2, first November 4
Median at 28°F
last March 19, first November 17

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 2Apr 27Apr 22Apr 19Apr 16Apr 12Apr 8Apr 4Mar 30
32°FApr 19Apr 13Apr 9Apr 5Apr 2Mar 30Mar 25Mar 21Mar 15
28°FApr 7Mar 31Mar 28Mar 24Mar 19Mar 15Mar 11Mar 4Feb 25
24°FMar 25Mar 19Mar 14Mar 9Mar 3Feb 28Feb 21Feb 15Feb 6
20°FMar 13Mar 5Feb 28Feb 19Feb 13Feb 7Feb 2Jan 26Jan 14
16°FMar 3Feb 18Feb 8Feb 2Jan 30Jan 24Jan 19Jan 10Jan 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 14Oct 19Oct 21Oct 24Oct 26Oct 28Oct 31Nov 2Nov 8
32°FOct 23Oct 27Oct 31Nov 1Nov 4Nov 7Nov 10Nov 15Nov 20
28°FNov 1Nov 6Nov 10Nov 13Nov 17Nov 20Nov 26Dec 1Dec 7
24°FNov 11Nov 19Nov 24Nov 29Dec 2Dec 6Dec 11Dec 19Dec 29
20°FNov 26Dec 3Dec 8Dec 14Dec 22Dec 27Jan 1Jan 7Jan 16
16°FDec 7Dec 13Dec 24Dec 30Jan 3Jan 7Jan 14Jan 21Feb 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°F217209203200196191186181175
32°F244234228222218213208202196
28°F273263256249243238232227218
24°F306295286279274267260252242
20°F341330322314306299292283271
16°F365361351342335330323312299

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
83% 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
3,097
Cooling degree days, base 65°F
1,724
Growing degree days, base 40°F
7,973
Growing degree days, base 45°F
6,405
Growing degree days, base 50°F
4,990
Growing degree days, base 55°F
3,734
Growing degree days, base 60°F
2,646

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January718138
February548152
March39411166
April17647336
May46158577
June2331778
July0440905
August0417882
September12251688
October14759386
November4137130
December639253

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 10.1 km from Acworth. 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 USC00092485 (Dallas 7 Ne). Public domain.