Everett climate

Everett Frost Dates and Growing Season

NOAA 1991-2020 normals for Everett, 0.7 km from Everett, elevation 1000 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Everett. 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 27 and the first fall freeze around October 17, a growing season of about 170 days.

Median at 36°F
last May 9, first October 6
Median at 32°F
last April 27, first October 17
Median at 28°F
last April 12, first October 29

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 27May 21May 17May 13May 9May 5Apr 30Apr 28Apr 23
32°FMay 16May 9May 4Apr 30Apr 27Apr 23Apr 20Apr 17Apr 12
28°FMay 1Apr 23Apr 19Apr 16Apr 12Apr 9Apr 7Apr 3Mar 30
24°FApr 12Apr 8Apr 5Apr 2Mar 31Mar 29Mar 26Mar 21Mar 15
20°FApr 1Mar 30Mar 26Mar 22Mar 19Mar 16Mar 13Mar 8Mar 2
16°FMar 23Mar 18Mar 15Mar 12Mar 8Mar 5Mar 1Feb 26Feb 19

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 23Sep 28Oct 1Oct 3Oct 6Oct 9Oct 12Oct 15Oct 20
32°FOct 3Oct 7Oct 11Oct 14Oct 17Oct 20Oct 22Oct 26Nov 1
28°FOct 11Oct 18Oct 22Oct 26Oct 29Nov 1Nov 3Nov 6Nov 10
24°FOct 25Oct 30Nov 2Nov 5Nov 9Nov 12Nov 15Nov 18Nov 24
20°FNov 5Nov 10Nov 15Nov 18Nov 21Nov 24Nov 28Dec 2Dec 10
16°FNov 18Nov 25Nov 30Dec 2Dec 7Dec 11Dec 17Dec 22Dec 29

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°F169162157152148143139133126
32°F192185180175170166161155147
28°F217211206202197192188181171
24°F244237230227223219214208201
20°F272263258254249243239234225
16°F302293288282276272266261252

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
5,621
Cooling degree days, base 65°F
745
Growing degree days, base 40°F
5,288
Growing degree days, base 45°F
4,079
Growing degree days, base 50°F
3,021
Growing degree days, base 55°F
2,115
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
January1,09702
February92503
March791124
April4446115
May19745324
June40145555
July5249710
August9209665
September9681437
October38310153
November677028
December95805

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 0.7 km from Everett. 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 USC00362721 (Everett). Public domain.