Nettleton climate

Nettleton Frost Dates and Growing Season

NOAA 1991-2020 normals for Verona Exp Stn, 12.6 km from Nettleton, elevation 325 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Verona Exp Stn. 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 21 and the first fall freeze around November 9, a growing season of about 233 days.

Median at 36°F
last April 3, first October 30
Median at 32°F
last March 21, first November 9
Median at 28°F
last March 6, first November 23

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 13Apr 9Apr 6Apr 3Mar 31Mar 29Mar 24Mar 17
32°FApr 6Apr 2Mar 29Mar 26Mar 21Mar 17Mar 13Mar 9Mar 1
28°FMar 27Mar 19Mar 14Mar 9Mar 6Mar 2Feb 27Feb 22Feb 15
24°FMar 13Mar 6Feb 28Feb 25Feb 21Feb 15Feb 9Feb 2Jan 25
20°FMar 4Feb 24Feb 15Feb 9Feb 2Jan 30Jan 24Jan 17Jan 6
16°FFeb 18Feb 6Jan 31Jan 28Jan 24Jan 19Jan 14Jan 6Dec 31

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 30Nov 1Nov 4Nov 8Nov 13
32°FOct 27Nov 1Nov 4Nov 6Nov 9Nov 13Nov 17Nov 22Nov 29
28°FNov 6Nov 10Nov 15Nov 19Nov 23Nov 27Dec 1Dec 5Dec 16
24°FNov 15Nov 23Nov 29Dec 3Dec 8Dec 15Dec 24Jan 1Jan 7
20°FDec 1Dec 9Dec 20Dec 27Jan 1Jan 3Jan 8Jan 14Jan 25
16°FDec 13Dec 29Jan 1Jan 4Jan 8Jan 13Jan 17Jan 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°F231223217212208204199194187
32°F258249243239233228223217210
28°F292280273267262256251244236
24°F328316307300292285278270258
20°F361348338331324317308301290
16°F365365365362352343335329316

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
99% of years
20°F or colder
91% of years
16°F or colder
63% 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
2,835
Cooling degree days, base 65°F
2,207
Growing degree days, base 40°F
8,694
Growing degree days, base 45°F
7,102
Growing degree days, base 50°F
5,654
Growing degree days, base 55°F
4,350
Growing degree days, base 60°F
3,199

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January694247
February529266
March34017206
April13269395
May21230674
June0419868
July0530995
August0507972
September7327769
October12492440
November37810158
December610365

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 12.6 km from Nettleton. 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 USC00229173 (Verona Exp Stn). Public domain.