Clearview Acres climate

Clearview Acres Frost Dates and Growing Season

NOAA 1991-2020 normals for Rock Springs Fire Dept, 3.1 km from Clearview Acres, elevation 6270 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Rock Springs Fire Dept. 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 24, a growing season of about 121 days.

Median at 36°F
last June 6, first September 14
Median at 32°F
last May 24, first September 24
Median at 28°F
last May 9, first October 3

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 21Jun 16Jun 12Jun 9Jun 6Jun 3Jun 1May 29May 24
32°FJun 9Jun 3May 31May 28May 24May 21May 17May 14May 8
28°FMay 26May 20May 15May 12May 9May 6May 3Apr 30Apr 25
24°FMay 11May 7May 3Apr 30Apr 28Apr 24Apr 20Apr 15Apr 10
20°FApr 29Apr 23Apr 18Apr 13Apr 9Apr 6Apr 3Mar 31Mar 21
16°FApr 15Apr 7Apr 2Mar 30Mar 24Mar 19Mar 15Mar 11Mar 6

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 5Sep 9Sep 11Sep 14Sep 16Sep 19Sep 22Sep 25
32°FSep 9Sep 15Sep 18Sep 21Sep 24Sep 26Sep 28Oct 1Oct 4
28°FSep 19Sep 23Sep 27Sep 30Oct 3Oct 5Oct 8Oct 12Oct 17
24°FSep 29Oct 4Oct 8Oct 12Oct 15Oct 18Oct 21Oct 25Oct 28
20°FOct 9Oct 16Oct 19Oct 22Oct 26Oct 29Nov 1Nov 3Nov 8
16°FOct 21Oct 26Oct 31Nov 2Nov 5Nov 7Nov 10Nov 14Nov 19

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°F1161101051019794908679
32°F14113413012512111811210799
28°F166160155150146141136131124
24°F193185178174170165161155147
20°F220212206202197193187181172
16°F246240233227222218212207199

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
7,553
Cooling degree days, base 65°F
302
Growing degree days, base 40°F
3,814
Growing degree days, base 45°F
2,814
Growing degree days, base 50°F
1,970
Growing degree days, base 55°F
1,276
Growing degree days, base 60°F
715

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,28700
February1,07800
March89902
April655015
May3953135
June12835362
July11148601
August29107544
September2169261
October578049
November96901
December1,30800

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 3.1 km from Clearview Acres. 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 USC00487847 (Rock Springs Fire Dept). Public domain.