Paradise Hills climate

Paradise Hills Frost Dates and Growing Season

NOAA 1991-2020 normals for Petroglyph Natl Mon, 6.9 km from Paradise Hills, elevation 5121 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Petroglyph Natl Mon. 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 15 and the first fall freeze around October 27, a growing season of about 193 days.

Median at 36°F
last April 27, first October 19
Median at 32°F
last April 15, first October 27
Median at 28°F
last March 31, first November 4

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 8May 4May 1Apr 29Apr 27Apr 24Apr 21Apr 18Apr 14
32°FApr 30Apr 25Apr 21Apr 18Apr 15Apr 12Apr 8Apr 5Mar 31
28°FApr 16Apr 10Apr 6Apr 3Mar 31Mar 27Mar 22Mar 17Mar 10
24°FMar 29Mar 23Mar 18Mar 13Mar 10Mar 7Mar 4Feb 28Feb 21
20°FMar 15Mar 8Mar 4Feb 28Feb 24Feb 18Feb 13Feb 6Jan 30
16°FFeb 26Feb 18Feb 11Feb 6Feb 1Jan 28Jan 23Jan 15Jan 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°FOct 7Oct 11Oct 14Oct 16Oct 19Oct 21Oct 23Oct 25Oct 29
32°FOct 16Oct 20Oct 22Oct 25Oct 27Oct 30Nov 1Nov 4Nov 7
28°FOct 23Oct 27Oct 31Nov 2Nov 4Nov 7Nov 10Nov 13Nov 17
24°FNov 2Nov 6Nov 10Nov 12Nov 15Nov 18Nov 21Nov 24Nov 29
20°FNov 11Nov 17Nov 21Nov 23Nov 27Nov 30Dec 4Dec 7Dec 11
16°FNov 24Nov 29Dec 3Dec 7Dec 10Dec 14Dec 18Dec 24Jan 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°F191184180177173170166163157
32°F214206202197193190186181175
28°F242234228222218213209203196
24°F271263258253249244239233225
20°F305296290284278273268262254
16°F341332326319314308301294285

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
99% 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
4,065
Cooling degree days, base 65°F
1,386
Growing degree days, base 40°F
6,808
Growing degree days, base 45°F
5,390
Growing degree days, base 50°F
4,153
Growing degree days, base 55°F
3,080
Growing degree days, base 60°F
2,159

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January86201
February63808
March487077
April2597219
May7494487
June2317765
July0429894
August0361826
September24166593
October23911256
November597028
December88301

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 6.9 km from Paradise Hills. 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 USC00296754 (Petroglyph Natl Mon). Public domain.