Hurley climate

Hurley Frost Dates and Growing Season

NOAA 1991-2020 normals for Hurley, 1.5 km from Hurley, elevation 1444 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Hurley. 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 May 24 and the first fall freeze around September 28, a growing season of about 128 days.

Median at 36°F
last June 3, first September 18
Median at 32°F
last May 24, first September 28
Median at 28°F
last May 8, first October 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°FJun 18Jun 13Jun 9Jun 6Jun 3Jun 1May 29May 26May 20
32°FJun 7Jun 2May 30May 27May 24May 20May 16May 11May 4
28°FMay 28May 22May 16May 12May 8May 5May 1Apr 28Apr 23
24°FMay 14May 6May 2Apr 30Apr 27Apr 24Apr 21Apr 17Apr 12
20°FApr 30Apr 26Apr 22Apr 19Apr 17Apr 14Apr 11Apr 7Apr 3
16°FApr 21Apr 18Apr 14Apr 11Apr 9Apr 6Apr 4Apr 1Mar 28

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 2Sep 8Sep 12Sep 15Sep 18Sep 21Sep 24Sep 28Oct 2
32°FSep 13Sep 19Sep 22Sep 25Sep 28Oct 1Oct 3Oct 6Oct 11
28°FSep 22Sep 28Oct 1Oct 4Oct 8Oct 11Oct 15Oct 18Oct 23
24°FOct 3Oct 10Oct 14Oct 18Oct 21Oct 24Oct 28Nov 1Nov 5
20°FOct 19Oct 24Oct 28Nov 1Nov 2Nov 4Nov 7Nov 11Nov 17
16°FOct 29Nov 1Nov 4Nov 6Nov 10Nov 12Nov 15Nov 19Nov 24

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°F126119113109105101979283
32°F150144137132128123118113105
28°F174166161157151146141135126
24°F198190185180175170165160151
20°F217210206200197193189184177
16°F233226221218213209205200194

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
9,205
Cooling degree days, base 65°F
285
Growing degree days, base 40°F
3,501
Growing degree days, base 45°F
2,604
Growing degree days, base 50°F
1,829
Growing degree days, base 55°F
1,170
Growing degree days, base 60°F
647

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,65100
February1,41100
March1,22804
April798024
May40814163
June14258373
July62108512
August8177461
September27026241
October663148
November1,04404
December1,44800

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 1.5 km from Hurley. 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 USC00473800 (Hurley). Public domain.