Edmond climate

Edmond Frost Dates and Growing Season

NOAA 1991-2020 normals for Guthrie 5S, 19.6 km from Edmond, elevation 1110 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Guthrie 5S. 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 10 and the first fall freeze around October 28, a growing season of about 199 days.

Median at 36°F
last April 22, first October 19
Median at 32°F
last April 10, first October 28
Median at 28°F
last March 30, first November 5

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 7May 2Apr 30Apr 25Apr 22Apr 19Apr 15Apr 11Apr 6
32°FApr 30Apr 22Apr 18Apr 13Apr 10Apr 6Apr 4Mar 30Mar 24
28°FApr 17Apr 10Apr 6Apr 3Mar 30Mar 26Mar 22Mar 17Mar 11
24°FApr 5Mar 31Mar 25Mar 21Mar 17Mar 13Mar 9Mar 4Feb 27
20°FMar 23Mar 16Mar 12Mar 9Mar 5Mar 2Feb 27Feb 23Feb 16
16°FMar 13Mar 9Mar 4Feb 28Feb 24Feb 21Feb 15Feb 8Jan 30

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 4Oct 9Oct 14Oct 17Oct 19Oct 22Oct 25Oct 28Nov 1
32°FOct 14Oct 19Oct 23Oct 25Oct 28Oct 31Nov 2Nov 5Nov 10
28°FOct 23Oct 28Oct 31Nov 3Nov 5Nov 8Nov 12Nov 15Nov 22
24°FOct 31Nov 4Nov 7Nov 11Nov 14Nov 17Nov 22Nov 27Dec 2
20°FNov 6Nov 13Nov 18Nov 22Nov 26Nov 30Dec 3Dec 7Dec 13
16°FNov 14Nov 24Nov 29Dec 3Dec 7Dec 12Dec 19Dec 24Jan 2

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°F199192187183179175170166159
32°F222214208204199195191186178
28°F243234229224220216212207197
24°F266258252246241236230225216
20°F292282275269264259253247235
16°F318307301294289283276269259

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
3,811
Cooling degree days, base 65°F
1,917
Growing degree days, base 40°F
7,746
Growing degree days, base 45°F
6,289
Growing degree days, base 50°F
4,979
Growing degree days, base 55°F
3,812
Growing degree days, base 60°F
2,794

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January870014
February670137
March48312138
April22447304
May63148552
June4358804
July05351,000
August0492956
September24254680
October19064361
November4886109
December796125

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 19.6 km from Edmond. 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 USC00343821 (Guthrie 5S). Public domain.