Beaver climate

Beaver Frost Dates and Growing Season

NOAA 1991-2020 normals for Beaver Canyon Pwr House, 13.9 km from Beaver, elevation 7275 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Beaver Canyon Pwr House. 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 1 and the first fall freeze around September 28, a growing season of about 120 days.

Median at 36°F
last June 10, first September 21
Median at 32°F
last June 1, first September 28
Median at 28°F
last May 19, first October 7

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 23Jun 19Jun 15Jun 12Jun 10Jun 7Jun 4Jun 2May 29
32°FJun 15Jun 9Jun 6Jun 3Jun 1May 29May 25May 21May 15
28°FJun 5Jun 1May 28May 23May 19May 15May 12May 7May 2
24°FMay 23May 16May 11May 8May 4May 1Apr 28Apr 24Apr 19
20°FMay 9May 3Apr 29Apr 26Apr 22Apr 19Apr 16Apr 12Apr 6
16°FApr 25Apr 19Apr 15Apr 10Apr 6Apr 3Mar 30Mar 23Mar 15

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 4Sep 10Sep 13Sep 18Sep 21Sep 23Sep 25Sep 28Oct 1
32°FSep 13Sep 19Sep 23Sep 26Sep 28Oct 1Oct 4Oct 7Oct 11
28°FSep 23Sep 28Oct 2Oct 5Oct 7Oct 10Oct 13Oct 17Oct 22
24°FOct 1Oct 5Oct 10Oct 13Oct 16Oct 20Oct 23Oct 27Nov 2
20°FOct 9Oct 15Oct 19Oct 23Oct 27Oct 31Nov 4Nov 8Nov 14
16°FOct 18Oct 25Oct 31Nov 4Nov 7Nov 11Nov 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°F11911310810410096928780
32°F14013312912412011511010497
28°F163155150145141136131126117
24°F185177172168164160155149142
20°F209200195190185181176171163
16°F241231225219214209204197187

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
7,627
Cooling degree days, base 65°F
114
Growing degree days, base 40°F
3,352
Growing degree days, base 45°F
2,404
Growing degree days, base 50°F
1,605
Growing degree days, base 55°F
948
Growing degree days, base 60°F
436

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,20100
February1,02500
March93301
April74207
May478194
June17312300
July4261484
August5737445
September2364236
October609038
November91702
December1,21400

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 13.9 km from Beaver. 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 USC00420527 (Beaver Canyon Pwr House). Public domain.