Cornville climate

Cornville Frost Dates and Growing Season

NOAA 1991-2020 normals for Tuzigoot, 11.3 km from Cornville, elevation 3470 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Tuzigoot. 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 30 and the first fall freeze around November 10, a growing season of about 223 days.

Median at 36°F
last April 17, first October 31
Median at 32°F
last March 30, first November 10
Median at 28°F
last March 5, first November 20

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 6Apr 30Apr 26Apr 22Apr 17Apr 13Apr 8Apr 4Mar 29
32°FApr 21Apr 11Apr 6Apr 2Mar 30Mar 25Mar 19Mar 15Mar 9
28°FMar 31Mar 18Mar 14Mar 9Mar 5Mar 2Feb 27Feb 22Feb 14
24°FMar 5Feb 27Feb 22Feb 18Feb 13Feb 8Feb 4Jan 29Jan 18
20°FFeb 20Feb 12Feb 6Feb 1Jan 24Jan 17Jan 8Jan 1Dec 22
16°FFeb 12Feb 2Jan 24Jan 13Jan 8Jan 4Jan 1Dec 25Dec 17

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 17Oct 21Oct 25Oct 28Oct 31Nov 2Nov 5Nov 8Nov 12
32°FOct 25Nov 1Nov 4Nov 7Nov 10Nov 13Nov 15Nov 18Nov 23
28°FNov 5Nov 10Nov 15Nov 17Nov 20Nov 23Nov 27Dec 1Dec 5
24°FNov 17Nov 22Nov 26Nov 30Dec 3Dec 6Dec 10Dec 14Dec 20
20°FNov 29Dec 4Dec 8Dec 12Dec 17Dec 23Dec 29Jan 5Jan 20
16°FDec 11Dec 18Dec 25Dec 31Jan 3Jan 7Jan 13Jan 29Feb 9

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°F218211204199194190185179171
32°F248239234229223219214209199
28°F282274268262257252247240230
24°F320309302296290285280273262
20°F360351345338331324316307296
16°F365365365365365364355347332

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
39% 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
2,657
Cooling degree days, base 65°F
2,136
Growing degree days, base 40°F
8,652
Growing degree days, base 45°F
6,968
Growing degree days, base 50°F
5,464
Growing degree days, base 55°F
4,172
Growing degree days, base 60°F
3,067

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January609015
February459050
March3302166
April14826334
May37171600
June1424873
July05871,052
August0526990
September2325772
October8473456
November3552141
December632013

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 11.3 km from Cornville. 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 USC00028904 (Tuzigoot). Public domain.