Achille climate

Achille Frost Dates and Growing Season

NOAA 1991-2020 normals for Durant 6SSE Mesonet, 11.5 km from Achille, elevation 646 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Durant 6SSE Mesonet. 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 19 and the first fall freeze around November 12, a growing season of about 237 days.

Median at 36°F
last April 2, first November 1
Median at 32°F
last March 19, first November 12
Median at 28°F
last March 5, 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 20Apr 15Apr 9Apr 5Apr 2Mar 29Mar 25Mar 20Mar 13
32°FApr 7Apr 1Mar 27Mar 23Mar 19Mar 14Mar 10Mar 6Mar 1
28°FMar 24Mar 17Mar 13Mar 9Mar 5Mar 2Feb 26Feb 22Feb 12
24°FMar 12Mar 6Mar 2Feb 26Feb 20Feb 13Feb 7Jan 31Jan 21
20°FMar 4Feb 25Feb 17Feb 9Feb 3Jan 30Jan 24Jan 17Jan 3
16°FFeb 21Feb 9Feb 2Jan 29Jan 22Jan 17Jan 8Jan 1Dec 21

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

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°F237228221217211207202197187
32°F262254247242237232227221212
28°F292282275269262257252245235
24°F322312304298292286279271261
20°F361349339333326319310302290
16°F365365365364355346339331316

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
91% of years
16°F or colder
64% 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
2,763
Cooling degree days, base 65°F
2,236
Growing degree days, base 40°F
8,786
Growing degree days, base 45°F
7,180
Growing degree days, base 50°F
5,705
Growing degree days, base 55°F
4,388
Growing degree days, base 60°F
3,230

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January679038
February507484
March32919213
April13256380
May31194628
June0418868
July05441,009
August05531,018
September4334780
October11899453
November34414181
December619255

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 11.5 km from Achille. 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 USC00342680 (Durant 6SSE Mesonet). Public domain.