Piute County climate

Piute County Frost Dates and Growing Season

NOAA 1991-2020 normals for Angle, 17.5 km from Piute County, elevation 6410 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Angle. 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 June 17 and the first fall freeze around September 12, a growing season of about 85 days.

Median at 32°F
last June 17, first September 12
Median at 28°F
last May 31, first September 23

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°F–––––––––
32°FJul 3Jun 28Jun 23Jun 20Jun 17Jun 14Jun 10Jun 6May 31
28°FJun 18Jun 12Jun 7Jun 3May 31May 27May 23May 18May 13
24°FJun 2May 24May 19May 15May 12May 8May 5May 2Apr 27
20°FMay 14May 9May 5May 1Apr 28Apr 24Apr 20Apr 16Apr 12
16°FMay 3Apr 26Apr 20Apr 15Apr 11Apr 8Apr 4Mar 31Mar 23

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°F–––––––––
32°FAug 30Sep 2Sep 6Sep 9Sep 12Sep 15Sep 17Sep 20Sep 24
28°FSep 7Sep 12Sep 16Sep 19Sep 23Sep 25Sep 27Sep 30Oct 3
24°FSep 18Sep 23Sep 27Sep 29Oct 1Oct 4Oct 7Oct 9Oct 16
20°FSep 29Oct 3Oct 6Oct 9Oct 13Oct 16Oct 20Oct 24Oct 29
16°FOct 9Oct 14Oct 19Oct 22Oct 25Oct 29Nov 1Nov 4Nov 9

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°F797267625853484132
32°F1059892898580767063
28°F1341261211171121071029790
24°F162156150146141136131125119
20°F189182176171167163157152144
16°F217209203198193187182175168

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
7,788
Cooling degree days, base 65°F
107
Growing degree days, base 40°F
3,282
Growing degree days, base 45°F
2,314
Growing degree days, base 50°F
1,521
Growing degree days, base 55°F
879
Growing degree days, base 60°F
398

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,27600
February1,02300
March89402
April691012
May456194
June19610275
July4260484
August6734432
September2762197
October622025
November94700
December1,29700

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 17.5 km from Piute County. 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 USC00420168 (Angle). Public domain.