Everly climate

Everly Frost Dates and Growing Season

NOAA 1991-2020 normals for Spencer Muni AP, 10.2 km from Everly, elevation 1338 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Spencer Muni AP. 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 2 and the first fall freeze around October 2, a growing season of about 154 days.

Median at 36°F
last May 9, first September 24
Median at 32°F
last May 2, first October 2
Median at 28°F
last April 22, first October 12

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 22May 18May 14May 12May 9May 7May 5May 2Apr 28
32°FMay 15May 10May 7May 4May 2Apr 29Apr 26Apr 22Apr 17
28°FMay 7May 2Apr 29Apr 25Apr 22Apr 19Apr 16Apr 12Apr 8
24°FApr 29Apr 22Apr 19Apr 15Apr 12Apr 9Apr 6Apr 2Mar 29
20°FApr 20Apr 14Apr 10Apr 7Apr 4Apr 1Mar 29Mar 23Mar 16
16°FApr 11Apr 5Apr 2Mar 30Mar 25Mar 21Mar 17Mar 13Mar 8

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 9Sep 14Sep 18Sep 20Sep 24Sep 27Sep 30Oct 3Oct 7
32°FSep 18Sep 22Sep 26Sep 29Oct 2Oct 5Oct 8Oct 11Oct 16
28°FSep 26Oct 1Oct 5Oct 8Oct 12Oct 16Oct 19Oct 22Oct 27
24°FOct 5Oct 12Oct 18Oct 21Oct 23Oct 25Oct 28Nov 1Nov 5
20°FOct 19Oct 24Oct 27Oct 29Nov 1Nov 4Nov 6Nov 10Nov 15
16°FOct 27Nov 1Nov 4Nov 6Nov 9Nov 11Nov 14Nov 18Nov 25

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°F155148144140136132128123118
32°F173166161157154150146141134
28°F193186181177172168164158152
24°F214207202197193188184177170
20°F233224220216211207203197189
16°F251243237232227224219213204

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
7,353
Cooling degree days, base 65°F
774
Growing degree days, base 40°F
4,904
Growing degree days, base 45°F
3,847
Growing degree days, base 50°F
2,898
Growing degree days, base 55°F
2,065
Growing degree days, base 60°F
1,355

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,48900
February1,21901
March955016
April538486
May22147311
June32176594
July7267725
August18190637
September14080399
October4949118
November911012
December1,32800

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 10.2 km from Everly. 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 USW00014972 (Spencer Muni AP). Public domain.