Lahoma climate

Lahoma Frost Dates and Growing Season

NOAA 1991-2020 normals for Lahoma 1WSW Mesonet, 2 km from Lahoma, elevation 1299 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Lahoma 1WSW Mesonet. 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 31, a growing season of about 204 days.

Median at 36°F
last April 22, first October 22
Median at 32°F
last April 10, first October 31
Median at 28°F
last March 29, first November 8

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 5May 1Apr 28Apr 25Apr 22Apr 19Apr 15Apr 12Apr 7
32°FApr 25Apr 21Apr 17Apr 13Apr 10Apr 7Apr 3Mar 31Mar 24
28°FApr 13Apr 8Apr 4Apr 1Mar 29Mar 25Mar 21Mar 15Mar 8
24°FApr 2Mar 28Mar 23Mar 18Mar 14Mar 11Mar 6Mar 3Feb 26
20°FMar 19Mar 13Mar 9Mar 5Mar 2Feb 28Feb 24Feb 19Feb 13
16°FMar 10Mar 4Feb 28Feb 24Feb 20Feb 16Feb 12Feb 5Jan 27

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 7Oct 13Oct 17Oct 19Oct 22Oct 24Oct 27Oct 30Nov 3
32°FOct 17Oct 22Oct 25Oct 28Oct 31Nov 2Nov 5Nov 9Nov 15
28°FOct 24Oct 30Nov 2Nov 5Nov 8Nov 11Nov 14Nov 18Nov 25
24°FNov 1Nov 6Nov 10Nov 14Nov 17Nov 20Nov 25Nov 29Dec 4
20°FNov 8Nov 15Nov 20Nov 25Nov 29Dec 2Dec 5Dec 11Dec 18
16°FNov 22Nov 29Dec 3Dec 7Dec 12Dec 17Dec 21Dec 28Jan 7

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°F204197192188184180175171163
32°F225218212208204200195191183
28°F249241234229225220216210203
24°F271263258252247242237232223
20°F297286281275269263258252243
16°F325315307302295289283275265

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
4,020
Cooling degree days, base 65°F
1,930
Growing degree days, base 40°F
7,566
Growing degree days, base 45°F
6,145
Growing degree days, base 50°F
4,874
Growing degree days, base 55°F
3,748
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
January88807
February710128
March5025109
April25326258
May73154547
June1382831
July05411,006
August0499964
September20260690
October20559344
November522381
December84609

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 2 km from Lahoma. 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 USC00344951 (Lahoma 1WSW Mesonet). Public domain.