Myton climate

Myton Frost Dates and Growing Season

NOAA 1991-2020 normals for Myton, 0.1 km from Myton, elevation 5085 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Myton. 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 7 and the first fall freeze around October 5, a growing season of about 149 days.

Median at 36°F
last May 23, first September 26
Median at 32°F
last May 7, first October 5
Median at 28°F
last April 24, first October 18

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 8Jun 2May 30May 26May 23May 19May 16May 11May 7
32°FMay 25May 19May 14May 10May 7May 4May 1Apr 28Apr 23
28°FMay 9May 4Apr 30Apr 27Apr 24Apr 21Apr 17Apr 13Apr 7
24°FApr 26Apr 21Apr 16Apr 12Apr 9Apr 6Apr 2Mar 31Mar 23
20°FApr 12Apr 6Apr 2Mar 31Mar 27Mar 22Mar 18Mar 13Mar 7
16°FMar 31Mar 23Mar 16Mar 11Mar 9Mar 6Mar 3Feb 28Feb 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°FSep 14Sep 18Sep 21Sep 24Sep 26Sep 28Oct 1Oct 4Oct 9
32°FSep 22Sep 26Sep 29Oct 3Oct 5Oct 9Oct 13Oct 16Oct 21
28°FOct 1Oct 7Oct 11Oct 15Oct 18Oct 21Oct 23Oct 26Oct 31
24°FOct 13Oct 18Oct 22Oct 25Oct 27Oct 30Nov 2Nov 5Nov 9
20°FOct 23Oct 28Oct 31Nov 3Nov 6Nov 8Nov 11Nov 14Nov 19
16°FOct 31Nov 5Nov 9Nov 12Nov 15Nov 17Nov 20Nov 23Nov 27

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°F146139135130125121116110104
32°F171164158153149145140134124
28°F196188183179174170165159151
24°F220213207203198194190184176
20°F247237231225221217212206197
16°F268261256251247242236230221

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
6,837
Cooling degree days, base 65°F
685
Growing degree days, base 40°F
4,845
Growing degree days, base 45°F
3,736
Growing degree days, base 50°F
2,767
Growing degree days, base 55°F
1,939
Growing degree days, base 60°F
1,245

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,43000
February1,06400
March764010
April485072
May23614263
June51124524
July3284745
August7218676
September11445386
October476189
November88802
December1,31900

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 0.1 km from Myton. 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 USC00425969 (Myton). Public domain.