Doyle climate

Doyle Frost Dates and Growing Season

NOAA 1991-2020 normals for Doyle 4 Sse, 6.5 km from Doyle, elevation 4390 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Doyle 4 Sse. 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 21 and the first fall freeze around October 1, a growing season of about 130 days.

Median at 36°F
last June 10, first September 12
Median at 32°F
last May 21, first October 1
Median at 28°F
last May 2, first October 17

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

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°F118110104989287817364
32°F159150143137130125119112104
28°F192183177172166161154146135
24°F228218211205200194187181171
20°F275263254246239231222213200
16°F313300290283276269262253243

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
5,680
Cooling degree days, base 65°F
352
Growing degree days, base 40°F
4,541
Growing degree days, base 45°F
3,303
Growing degree days, base 50°F
2,283
Growing degree days, base 55°F
1,466
Growing degree days, base 60°F
822

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January98101
February75901
March667016
April522050
May3137192
June11840375
July18158604
August26119558
September12726354
October4141120
November746010
December99002

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 6.5 km from Doyle. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00042506 (Doyle 4 Sse). Public domain.