Enon climate

Enon Frost Dates and Growing Season

NOAA 1991-2020 normals for New Carlisle, 10.1 km from Enon, elevation 874 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for New Carlisle. 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 24 and the first fall freeze around October 17, a growing season of about 173 days.

Median at 36°F
last May 4, first October 5
Median at 32°F
last April 24, first October 17
Median at 28°F
last April 12, first October 27

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 21May 15May 10May 7May 4May 1Apr 29Apr 24Apr 20
32°FMay 10May 5May 1Apr 28Apr 24Apr 21Apr 19Apr 15Apr 10
28°FApr 28Apr 22Apr 18Apr 15Apr 12Apr 9Apr 6Apr 4Mar 31
24°FApr 14Apr 9Apr 6Apr 3Apr 1Mar 30Mar 26Mar 22Mar 17
20°FApr 4Mar 31Mar 29Mar 25Mar 22Mar 19Mar 15Mar 11Mar 4
16°FMar 28Mar 22Mar 18Mar 14Mar 12Mar 8Mar 5Feb 28Feb 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°FSep 23Sep 27Sep 30Oct 3Oct 5Oct 8Oct 10Oct 14Oct 17
32°FOct 4Oct 9Oct 12Oct 14Oct 17Oct 20Oct 22Oct 25Oct 29
28°FOct 13Oct 18Oct 21Oct 24Oct 27Oct 30Nov 1Nov 4Nov 9
24°FOct 25Oct 31Nov 2Nov 4Nov 7Nov 10Nov 15Nov 19Nov 25
20°FNov 5Nov 10Nov 14Nov 17Nov 20Nov 24Nov 29Dec 3Dec 12
16°FNov 14Nov 21Nov 26Dec 1Dec 3Dec 7Dec 14Dec 20Dec 25

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°F171165161157153149145140133
32°F192185181177173169164160154
28°F217210206201197193189184176
24°F242234229224220216212208200
20°F272260254250244240235229223
16°F293285279273267262256251242

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
100% of years
16°F or colder
100% 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
5,595
Cooling degree days, base 65°F
854
Growing degree days, base 40°F
5,500
Growing degree days, base 45°F
4,278
Growing degree days, base 50°F
3,221
Growing degree days, base 55°F
2,309
Growing degree days, base 60°F
1,516

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,16700
February95501
March766017
April4243118
May15947365
June17183616
July1273737
August5228688
September79107479
October35214173
November671027
December99900

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 Enon. 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 USC00335786 (New Carlisle). Public domain.