Kingfisher climate

Kingfisher Frost Dates and Growing Season

NOAA 1991-2020 normals for Kingfisher, 0.4 km from Kingfisher, elevation 1050 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Kingfisher. 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 8 and the first fall freeze around November 1, a growing season of about 206 days.

Median at 36°F
last April 20, first October 23
Median at 32°F
last April 8, first November 1
Median at 28°F
last March 29, first November 7

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 2Apr 29Apr 26Apr 22Apr 20Apr 16Apr 13Apr 10Apr 4
32°FApr 24Apr 19Apr 15Apr 11Apr 8Apr 5Apr 2Mar 30Mar 23
28°FApr 13Apr 8Apr 4Apr 1Mar 29Mar 25Mar 20Mar 14Mar 7
24°FApr 3Mar 29Mar 24Mar 18Mar 14Mar 10Mar 6Mar 1Feb 25
20°FMar 21Mar 15Mar 10Mar 6Mar 3Feb 28Feb 25Feb 21Feb 13
16°FMar 12Mar 5Mar 1Feb 26Feb 22Feb 17Feb 11Feb 3Jan 25

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 11Oct 16Oct 19Oct 21Oct 23Oct 26Oct 29Nov 1Nov 4
32°FOct 19Oct 23Oct 26Oct 29Nov 1Nov 2Nov 5Nov 8Nov 12
28°FOct 26Oct 31Nov 2Nov 5Nov 7Nov 10Nov 14Nov 17Nov 23
24°FNov 1Nov 4Nov 9Nov 13Nov 16Nov 20Nov 24Nov 28Dec 3
20°FNov 5Nov 13Nov 19Nov 23Nov 26Nov 30Dec 4Dec 9Dec 18
16°FNov 19Nov 26Dec 1Dec 5Dec 11Dec 18Dec 24Dec 31Jan 10

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°F205198194190186182178174167
32°F226218214210206202197192186
28°F250240234230224220215210203
24°F272263257252247243237230221
20°F297286279274269263256250241
16°F328315306300293287280271262

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
3,806
Cooling degree days, base 65°F
2,033
Growing degree days, base 40°F
7,827
Growing degree days, base 45°F
6,373
Growing degree days, base 50°F
5,074
Growing degree days, base 55°F
3,921
Growing degree days, base 60°F
2,909

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January868010
February683026
March4807123
April22934280
May52162576
June1397846
July05601,024
August0522987
September18279711
October17467374
November5014100
December800016

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 0.4 km from Kingfisher. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00344861 (Kingfisher). Public domain.