Erda climate

Erda Frost Dates and Growing Season

NOAA 1991-2020 normals for Tooele, 8.8 km from Erda, elevation 4944 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Tooele. 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 2 and the first fall freeze around October 16, a growing season of about 165 days.

Median at 36°F
last May 16, first October 6
Median at 32°F
last May 2, first October 16
Median at 28°F
last April 16, first October 27

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 6May 31May 25May 20May 16May 11May 8May 4Apr 29
32°FMay 28May 17May 11May 6May 2Apr 29Apr 26Apr 21Apr 16
28°FMay 7May 1Apr 24Apr 19Apr 16Apr 12Apr 7Apr 3Mar 29
24°FApr 15Apr 7Apr 3Mar 30Mar 26Mar 21Mar 15Mar 10Mar 4
20°FMar 30Mar 23Mar 15Mar 10Mar 6Mar 2Feb 28Feb 24Feb 18
16°FMar 9Mar 4Feb 28Feb 24Feb 20Feb 15Feb 12Feb 8Feb 2

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 23Sep 28Oct 1Oct 4Oct 6Oct 9Oct 12Oct 15Oct 19
32°FOct 2Oct 7Oct 11Oct 14Oct 16Oct 19Oct 22Oct 27Nov 2
28°FOct 13Oct 17Oct 21Oct 24Oct 27Oct 31Nov 4Nov 8Nov 12
24°FOct 22Oct 28Nov 1Nov 5Nov 8Nov 11Nov 15Nov 19Nov 22
20°FNov 1Nov 7Nov 11Nov 15Nov 19Nov 21Nov 24Nov 27Dec 2
16°FNov 11Nov 16Nov 21Nov 24Nov 27Nov 30Dec 3Dec 7Dec 12

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°F165156151146141136130123114
32°F190181175171165160155147138
28°F218209202198193187183176165
24°F252243237230225219214207199
20°F277269264260255250245238228
16°F303295289284279274269263255

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
5,791
Cooling degree days, base 65°F
1,087
Growing degree days, base 40°F
5,492
Growing degree days, base 45°F
4,307
Growing degree days, base 50°F
3,287
Growing degree days, base 55°F
2,420
Growing degree days, base 60°F
1,691

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,09600
February86002
March682027
April474394
May23841293
June62174564
July5399860
August5348809
September92113477
October4077145
November773016
December1,09901

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 8.8 km from Erda. 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 USC00428771 (Tooele). Public domain.