Nowata County climate

Nowata County Frost Dates and Growing Season

NOAA 1991-2020 normals for Nowata, 12.2 km from Nowata County, elevation 710 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Nowata. 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 4 and the first fall freeze around November 1, a growing season of about 210 days.

Median at 36°F
last April 14, first October 24
Median at 32°F
last April 4, first November 1
Median at 28°F
last March 26, first November 10

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 1Apr 26Apr 22Apr 18Apr 14Apr 11Apr 8Apr 5Mar 31
32°FApr 21Apr 14Apr 10Apr 7Apr 4Apr 1Mar 29Mar 25Mar 20
28°FApr 9Apr 5Apr 1Mar 29Mar 26Mar 23Mar 19Mar 16Mar 9
24°FMar 31Mar 26Mar 22Mar 18Mar 15Mar 12Mar 8Mar 3Feb 26
20°FMar 22Mar 16Mar 12Mar 8Mar 5Mar 2Feb 27Feb 21Feb 15
16°FMar 14Mar 9Mar 5Mar 1Feb 26Feb 21Feb 16Feb 9Jan 31

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 13Oct 17Oct 20Oct 24Oct 26Oct 29Nov 1Nov 4
32°FOct 18Oct 23Oct 27Oct 29Nov 1Nov 3Nov 5Nov 9Nov 14
28°FOct 27Nov 1Nov 3Nov 7Nov 10Nov 13Nov 17Nov 20Nov 26
24°FNov 1Nov 6Nov 11Nov 15Nov 19Nov 23Nov 27Dec 1Dec 5
20°FNov 10Nov 16Nov 21Nov 26Nov 30Dec 2Dec 5Dec 10Dec 16
16°FNov 20Nov 28Dec 2Dec 6Dec 10Dec 15Dec 19Dec 23Dec 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°F211204199195190186182177169
32°F231223218214210206202197190
28°F253244238232228225219215207
24°F273264259254249244238232224
20°F294285278273268263258252242
16°F320310301295290285279271263

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
3,643
Cooling degree days, base 65°F
1,874
Growing degree days, base 40°F
7,817
Growing degree days, base 45°F
6,333
Growing degree days, base 50°F
4,997
Growing degree days, base 55°F
3,810
Growing degree days, base 60°F
2,769

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January868014
February656135
March4379146
April19442318
May44147567
June1375823
July0513978
August0488953
September27237661
October16854364
November4679119
December781019

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 12.2 km from Nowata County. 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 USC00346485 (Nowata). Public domain.