Kanab climate

Kanab Frost Dates and Growing Season

NOAA 1991-2020 normals for Kanab, 2.3 km from Kanab, elevation 4900 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Kanab. 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 29 and the first fall freeze around October 22, a growing season of about 175 days.

Median at 36°F
last May 15, first October 12
Median at 32°F
last April 29, first October 22
Median at 28°F
last April 11, first November 2

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 2May 28May 23May 18May 15May 11May 6May 2Apr 28
32°FMay 18May 12May 5May 1Apr 29Apr 25Apr 22Apr 18Apr 12
28°FMay 1Apr 23Apr 19Apr 15Apr 11Apr 8Apr 4Mar 30Mar 20
24°FApr 12Apr 6Apr 1Mar 26Mar 20Mar 14Mar 10Mar 4Feb 26
20°FMar 23Mar 11Mar 5Mar 1Feb 27Feb 22Feb 18Feb 12Feb 3
16°FMar 4Feb 26Feb 20Feb 15Feb 11Feb 5Jan 31Jan 23Jan 12

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 28Oct 2Oct 5Oct 8Oct 12Oct 14Oct 17Oct 21Oct 26
32°FOct 6Oct 12Oct 16Oct 19Oct 22Oct 26Oct 29Nov 1Nov 5
28°FOct 16Oct 22Oct 27Oct 31Nov 2Nov 5Nov 8Nov 12Nov 16
24°FOct 27Nov 2Nov 6Nov 10Nov 14Nov 16Nov 19Nov 22Nov 28
20°FNov 7Nov 14Nov 18Nov 21Nov 24Nov 27Dec 1Dec 5Dec 11
16°FNov 18Nov 23Nov 27Nov 30Dec 4Dec 8Dec 12Dec 17Dec 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°F171164159153149144140134127
32°F198189183179175171166159150
28°F226216212207202197193186178
24°F263256248242234228221215206
20°F298290282275270264259251239
16°F333322314307301295289281272

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
4,359
Cooling degree days, base 65°F
1,094
Growing degree days, base 40°F
6,236
Growing degree days, base 45°F
4,844
Growing degree days, base 50°F
3,655
Growing degree days, base 55°F
2,641
Growing degree days, base 60°F
1,793

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January86300
February67504
March546042
April3542142
May14441369
June19202633
July0385849
August1326790
September29131552
October2588237
November590035
December88200

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 2.3 km from Kanab. 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 USC00424508 (Kanab). Public domain.