North Ogden climate

North Ogden Frost Dates and Growing Season

NOAA 1991-2020 normals for Ogden Ne Bench, 7.1 km from North Ogden, elevation 4572 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Ogden Ne Bench. 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 April 19 and the first fall freeze around October 22, a growing season of about 186 days.

Median at 36°F
last May 2, first October 12
Median at 32°F
last April 19, first October 22
Median at 28°F
last April 2, first November 1

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°FMay 20May 13May 8May 4May 2Apr 30Apr 26Apr 23Apr 18
32°FMay 4Apr 30Apr 26Apr 22Apr 19Apr 16Apr 12Apr 8Apr 2
28°FApr 20Apr 15Apr 11Apr 7Apr 2Mar 31Mar 25Mar 19Mar 12
24°FApr 7Mar 31Mar 25Mar 19Mar 15Mar 10Mar 7Mar 3Feb 25
20°FMar 16Mar 10Mar 7Mar 3Feb 28Feb 24Feb 19Feb 15Feb 8
16°FMar 4Feb 27Feb 21Feb 16Feb 12Feb 7Feb 3Jan 31Jan 20

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 29Oct 3Oct 6Oct 9Oct 12Oct 15Oct 18Oct 22Oct 25
32°FOct 7Oct 13Oct 16Oct 19Oct 22Oct 25Oct 28Oct 31Nov 5
28°FOct 18Oct 23Oct 26Oct 30Nov 1Nov 5Nov 8Nov 13Nov 18
24°FOct 26Nov 1Nov 5Nov 10Nov 13Nov 16Nov 20Nov 23Nov 27
20°FNov 6Nov 12Nov 16Nov 19Nov 22Nov 25Nov 28Dec 1Dec 8
16°FNov 14Nov 19Nov 24Nov 28Dec 1Dec 6Dec 11Dec 16Dec 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°F182175170166162158154149139
32°F208201195190186181176171165
28°F236227221216212207202196188
24°F265257251245239234230222214
20°F291283278272267262256249239
16°F321312305299293287282275264

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
871
Growing degree days, base 40°F
5,221
Growing degree days, base 45°F
4,037
Growing degree days, base 50°F
3,024
Growing degree days, base 55°F
2,173
Growing degree days, base 60°F
1,459

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,09900
February85702
March702018
April490272
May22830284
June61133524
July4329790
August4291751
September10882434
October4225133
November755016
December1,06300

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 7.1 km from North Ogden. 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 USC00426405 (Ogden Ne Bench). Public domain.