Kingman County climate

Kingman County Frost Dates and Growing Season

NOAA 1991-2020 normals for Kingman, 9.6 km from Kingman County, elevation 1547 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Kingman. 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 15 and the first fall freeze around October 21, a growing season of about 187 days.

Median at 36°F
last April 26, first October 12
Median at 32°F
last April 15, first October 21
Median at 28°F
last April 5, first October 31

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

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 27Oct 1Oct 5Oct 9Oct 12Oct 14Oct 17Oct 20Oct 23
32°FOct 5Oct 12Oct 15Oct 18Oct 21Oct 23Oct 26Oct 30Nov 4
28°FOct 16Oct 21Oct 25Oct 28Oct 31Nov 3Nov 5Nov 8Nov 13
24°FOct 24Oct 30Nov 2Nov 5Nov 8Nov 11Nov 14Nov 18Nov 24
20°FNov 1Nov 6Nov 10Nov 13Nov 16Nov 21Nov 24Nov 29Dec 4
16°FNov 8Nov 15Nov 19Nov 23Nov 27Dec 1Dec 4Dec 9Dec 15

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°F187180174171167163160155148
32°F209201195191187183178173167
28°F230222217212207203199195186
24°F250243237232228223219214206
20°F273265258253248244239233225
16°F293285279274269264258251244

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
4,844
Cooling degree days, base 65°F
1,558
Growing degree days, base 40°F
6,724
Growing degree days, base 45°F
5,413
Growing degree days, base 50°F
4,245
Growing degree days, base 55°F
3,215
Growing degree days, base 60°F
2,320

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,03802
February822011
March617270
April32416199
May106105467
June6314757
July1481945
August1415879
September46196602
October28229257
November622154
December97903

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 9.6 km from Kingman 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 USC00144313 (Kingman). Public domain.