Henning climate

Henning Frost Dates and Growing Season

NOAA 1991-2020 normals for Ripley, 8.4 km from Henning, elevation 400 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Ripley. 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 26 and the first fall freeze around November 6, a growing season of about 227 days.

Median at 36°F
last April 7, first October 28
Median at 32°F
last March 26, first November 6
Median at 28°F
last March 14, first November 18

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 25Apr 19Apr 14Apr 10Apr 7Apr 4Mar 31Mar 28Mar 21
32°FApr 14Apr 7Apr 2Mar 31Mar 26Mar 21Mar 18Mar 14Mar 8
28°FApr 1Mar 27Mar 21Mar 17Mar 14Mar 10Mar 6Mar 1Feb 23
24°FMar 20Mar 15Mar 9Mar 6Mar 2Feb 27Feb 22Feb 17Feb 8
20°FMar 13Mar 5Feb 28Feb 24Feb 18Feb 13Feb 7Jan 31Jan 22
16°FMar 2Feb 23Feb 16Feb 8Feb 3Jan 30Jan 23Jan 18Jan 8

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

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°F225218212209204200195190184
32°F250241235230227222217212204
28°F275266260254249243239233225
24°F305295287279274268263257249
20°F335324315308301296289280271
16°F365352343334329322314306297

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
99% of years
16°F or colder
93% 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
3,478
Cooling degree days, base 65°F
1,757
Growing degree days, base 40°F
7,791
Growing degree days, base 45°F
6,292
Growing degree days, base 50°F
4,933
Growing degree days, base 55°F
3,725
Growing degree days, base 60°F
2,663

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January820023
February614144
March4527135
April18247333
May42175599
June1357805
July0459924
August0414879
September18234666
October16656369
November4587120
December724138

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 8.4 km from Henning. 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 USC00407710 (Ripley). Public domain.