Okeene climate

Okeene Frost Dates and Growing Season

NOAA 1991-2020 normals for Okeene, 0.7 km from Okeene, elevation 1215 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Okeene. 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 7 and the first fall freeze around November 2, a growing season of about 208 days.

Median at 36°F
last April 19, first October 25
Median at 32°F
last April 7, first November 2
Median at 28°F
last March 26, first November 9

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 3Apr 29Apr 25Apr 22Apr 19Apr 15Apr 12Apr 9Apr 3
32°FApr 24Apr 19Apr 15Apr 11Apr 7Apr 4Apr 1Mar 28Mar 20
28°FApr 13Apr 6Apr 2Mar 30Mar 26Mar 22Mar 17Mar 12Mar 6
24°FApr 1Mar 25Mar 18Mar 14Mar 10Mar 6Mar 3Feb 28Feb 22
20°FMar 16Mar 9Mar 5Mar 2Feb 28Feb 25Feb 21Feb 16Feb 6
16°FMar 7Mar 2Feb 28Feb 23Feb 18Feb 13Feb 7Jan 29Jan 18

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 8Oct 15Oct 19Oct 22Oct 25Oct 27Oct 30Nov 1Nov 6
32°FOct 21Oct 26Oct 29Oct 31Nov 2Nov 4Nov 7Nov 11Nov 16
28°FOct 28Nov 1Nov 4Nov 6Nov 9Nov 12Nov 16Nov 20Nov 27
24°FNov 2Nov 7Nov 12Nov 16Nov 19Nov 23Nov 27Dec 2Dec 7
20°FNov 10Nov 17Nov 22Nov 27Dec 1Dec 5Dec 9Dec 15Dec 24
16°FNov 21Nov 29Dec 5Dec 10Dec 15Dec 22Dec 28Jan 4Jan 13

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°F207200195191186181178172166
32°F229222217212208204198194187
28°F255246240234229224219213204
24°F281271265259254249243235225
20°F306297290284277272265258247
16°F337324315309303297291283273

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
99% 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
3,526
Cooling degree days, base 65°F
2,095
Growing degree days, base 40°F
8,092
Growing degree days, base 45°F
6,594
Growing degree days, base 50°F
5,251
Growing degree days, base 55°F
4,058
Growing degree days, base 60°F
3,006

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January815014
February640137
March42211158
April19145321
May42176599
June1414862
July05631,028
August0521986
September16289723
October15470395
November4756111
December769019

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 0.7 km from Okeene. 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 USC00346629 (Okeene). Public domain.