Schulter climate

Schulter Frost Dates and Growing Season

NOAA 1991-2020 normals for Okmulgee Wtr Wks, 13.6 km from Schulter, elevation 647 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Okmulgee Wtr Wks. 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 October 28, a growing season of about 203 days.

Median at 36°F
last April 19, first October 20
Median at 32°F
last April 8, first October 28
Median at 28°F
last March 29, first November 6

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 23Apr 19Apr 15Apr 12Apr 8Mar 31
32°FApr 25Apr 20Apr 14Apr 11Apr 8Apr 5Apr 1Mar 28Mar 23
28°FApr 15Apr 8Apr 5Apr 1Mar 29Mar 25Mar 21Mar 16Mar 11
24°FApr 3Mar 27Mar 23Mar 19Mar 15Mar 12Mar 8Mar 4Feb 28
20°FMar 19Mar 14Mar 10Mar 6Mar 4Mar 1Feb 27Feb 23Feb 15
16°FMar 11Mar 5Mar 2Feb 28Feb 23Feb 19Feb 13Feb 5Jan 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 5Oct 9Oct 13Oct 17Oct 20Oct 22Oct 25Oct 29Nov 2
32°FOct 12Oct 19Oct 23Oct 26Oct 28Oct 31Nov 3Nov 6Nov 11
28°FOct 22Oct 28Oct 31Nov 3Nov 6Nov 9Nov 13Nov 18Nov 23
24°FOct 31Nov 5Nov 9Nov 12Nov 17Nov 22Nov 25Nov 30Dec 4
20°FNov 8Nov 15Nov 21Nov 25Nov 29Dec 2Dec 5Dec 10Dec 16
16°FNov 21Nov 28Dec 3Dec 6Dec 11Dec 16Dec 21Dec 30Jan 8

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°F204196192188184179175170164
32°F224217211207203199195188181
28°F247240234229224220214210200
24°F271263256249245240235229221
20°F295285279274270264259252244
16°F320311304299292287280274266

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
3,599
Cooling degree days, base 65°F
1,812
Growing degree days, base 40°F
7,728
Growing degree days, base 45°F
6,246
Growing degree days, base 50°F
4,917
Growing degree days, base 55°F
3,734
Growing degree days, base 60°F
2,701

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January839016
February653027
March4438135
April20139306
May49141557
June2350798
July0513978
August0464928
September21237666
October17655360
November4686122
December749025

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 13.6 km from Schulter. 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 USC00346670 (Okmulgee Wtr Wks). Public domain.