Moreland climate

Moreland Frost Dates and Growing Season

NOAA 1991-2020 normals for Blackfoot Fire Dept, 8.6 km from Moreland, elevation 4499 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Blackfoot 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 5 and the first fall freeze around October 3, a growing season of about 149 days.

Median at 36°F
last May 23, first September 21
Median at 32°F
last May 5, first October 3
Median at 28°F
last April 22, first October 16

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 14Jun 6Jun 2May 27May 23May 19May 16May 12May 8
32°FMay 22May 15May 11May 8May 5May 3Apr 30Apr 28Apr 23
28°FMay 4Apr 30Apr 28Apr 25Apr 22Apr 19Apr 15Apr 12Apr 6
24°FApr 21Apr 16Apr 12Apr 8Apr 5Apr 2Mar 30Mar 23Mar 15
20°FApr 6Apr 1Mar 27Mar 22Mar 16Mar 12Mar 9Mar 5Feb 28
16°FMar 23Mar 14Mar 10Mar 6Mar 4Mar 1Feb 27Feb 22Feb 16

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 14Sep 18Sep 21Sep 24Sep 28Oct 1Oct 5
32°FSep 16Sep 23Sep 28Oct 1Oct 3Oct 6Oct 9Oct 13Oct 18
28°FSep 30Oct 5Oct 9Oct 13Oct 16Oct 19Oct 22Oct 24Oct 31
24°FOct 13Oct 18Oct 21Oct 24Oct 27Oct 30Nov 1Nov 5Nov 11
20°FOct 22Oct 27Oct 31Nov 2Nov 6Nov 10Nov 13Nov 18Nov 23
16°FOct 30Nov 4Nov 10Nov 13Nov 17Nov 20Nov 24Nov 27Dec 1

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°F14213412912311811310910090
32°F169162157153149145139133125
28°F196189184179176172168163155
24°F228218213207203198194188181
20°F258248243239233228221215204
16°F279271266261256250245239231

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
6,990
Cooling degree days, base 65°F
519
Growing degree days, base 40°F
4,305
Growing degree days, base 45°F
3,240
Growing degree days, base 50°F
2,337
Growing degree days, base 55°F
1,586
Growing degree days, base 60°F
978

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,27100
February1,01500
March80807
April569043
May31512195
June12068401
July18218665
August23179622
September17441329
October536171
November89604
December1,24600

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 8.6 km from Moreland. 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 USC00100915 (Blackfoot Fire Dept). Public domain.