Odon climate

Odon Frost Dates and Growing Season

NOAA 1991-2020 normals for Elnora, 9.2 km from Odon, elevation 480 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Elnora. 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 9 and the first fall freeze around October 25, a growing season of about 197 days.

Median at 36°F
last April 21, first October 15
Median at 32°F
last April 9, first October 25
Median at 28°F
last March 31, first November 4

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 27Apr 24Apr 21Apr 18Apr 14Apr 10Apr 6
32°FApr 25Apr 20Apr 16Apr 12Apr 9Apr 6Apr 3Apr 1Mar 27
28°FApr 15Apr 8Apr 5Apr 2Mar 31Mar 28Mar 24Mar 19Mar 13
24°FApr 3Mar 29Mar 25Mar 22Mar 18Mar 15Mar 11Mar 7Mar 1
20°FMar 23Mar 18Mar 15Mar 11Mar 8Mar 4Mar 1Feb 25Feb 16
16°FMar 16Mar 12Mar 7Mar 3Feb 28Feb 25Feb 19Feb 12Feb 2

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 1Oct 6Oct 10Oct 13Oct 15Oct 18Oct 20Oct 23Oct 28
32°FOct 12Oct 16Oct 20Oct 23Oct 25Oct 28Oct 31Nov 2Nov 7
28°FOct 22Oct 27Oct 31Nov 2Nov 4Nov 7Nov 12Nov 16Nov 22
24°FNov 1Nov 6Nov 10Nov 14Nov 17Nov 20Nov 24Nov 28Dec 4
20°FNov 10Nov 16Nov 21Nov 26Nov 29Dec 2Dec 6Dec 10Dec 18
16°FNov 19Nov 27Dec 1Dec 5Dec 9Dec 13Dec 19Dec 24Dec 30

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°F196189183179175171168162156
32°F218210206201197193189183177
28°F241233228224219214209205197
24°F267258251247242238233227219
20°F292283275270265259254248241
16°F315303297291285280274267257

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
4,622
Cooling degree days, base 65°F
1,314
Growing degree days, base 40°F
6,641
Growing degree days, base 45°F
5,302
Growing degree days, base 50°F
4,106
Growing degree days, base 55°F
3,043
Growing degree days, base 60°F
2,113

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,04404
February823015
March599481
April27121242
May80131517
June3274721
July1362826
August2316780
September41166575
October25436278
November598257
December907010

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 9.2 km from Odon. 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 USC00122620 (Elnora). Public domain.