Haskell climate

Haskell Frost Dates and Growing Season

NOAA 1991-2020 normals for Haskell, 0.8 km from Haskell, elevation 1590 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Haskell. 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 March 28 and the first fall freeze around November 7, a growing season of about 225 days.

Median at 36°F
last April 8, first October 31
Median at 32°F
last March 28, first November 7
Median at 28°F
last March 15, first November 17

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°FApr 25Apr 20Apr 16Apr 12Apr 8Apr 5Apr 2Mar 30Mar 23
32°FApr 14Apr 7Apr 3Apr 1Mar 28Mar 23Mar 19Mar 14Mar 9
28°FApr 3Mar 30Mar 25Mar 19Mar 15Mar 10Mar 6Mar 1Feb 24
24°FMar 22Mar 15Mar 9Mar 5Mar 1Feb 27Feb 22Feb 18Feb 10
20°FMar 11Mar 5Feb 28Feb 23Feb 18Feb 12Feb 8Jan 31Jan 22
16°FMar 4Feb 22Feb 13Feb 7Feb 2Jan 29Jan 20Jan 10Dec 30

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 17Oct 22Oct 26Oct 28Oct 31Nov 2Nov 5Nov 8Nov 13
32°FOct 25Oct 31Nov 3Nov 5Nov 7Nov 10Nov 14Nov 17Nov 24
28°FNov 2Nov 6Nov 10Nov 13Nov 17Nov 22Nov 25Nov 29Dec 4
24°FNov 11Nov 17Nov 21Nov 25Nov 29Dec 2Dec 5Dec 11Dec 19
20°FNov 23Nov 29Dec 4Dec 8Dec 14Dec 19Dec 25Jan 1Jan 12
16°FDec 3Dec 9Dec 16Dec 22Dec 29Jan 4Jan 12Jan 22Feb 4

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°F224217212208203199195190183
32°F250241235230225220214209201
28°F272265258253248243236230222
24°F300289282276271265259254245
20°F334321313306300294287279269
16°F365354344336329322312304292

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
99% of years
16°F or colder
86% 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
2,967
Cooling degree days, base 65°F
2,314
Growing degree days, base 40°F
8,715
Growing degree days, base 45°F
7,144
Growing degree days, base 50°F
5,711
Growing degree days, base 55°F
4,428
Growing degree days, base 60°F
3,295

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January705031
February542260
March35216203
April13675402
May29246683
June0445895
July05721,037
August05421,007
September12309747
October12998447
November39310160
December670040

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 0.8 km from Haskell. 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 USC00413992 (Haskell). Public domain.