Everett climate

Everett Frost Dates and Growing Season

NOAA 1991-2020 normals for Boston Logan Intl AP, 6.4 km from Everett, elevation 12 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Boston Logan Intl 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 April 4 and the first fall freeze around November 9, a growing season of about 218 days.

Median at 36°F
last April 17, first October 29
Median at 32°F
last April 4, first November 9
Median at 28°F
last March 28, first November 21

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 1Apr 26Apr 22Apr 19Apr 17Apr 15Apr 12Apr 9Apr 6
32°FApr 17Apr 11Apr 8Apr 6Apr 4Apr 3Apr 1Mar 30Mar 25
28°FApr 6Apr 3Apr 1Mar 30Mar 28Mar 25Mar 22Mar 19Mar 15
24°FApr 1Mar 28Mar 24Mar 21Mar 19Mar 16Mar 13Mar 10Mar 6
20°FMar 25Mar 20Mar 17Mar 14Mar 11Mar 8Mar 5Mar 2Feb 24
16°FMar 19Mar 13Mar 8Mar 5Mar 2Feb 27Feb 23Feb 16Feb 9

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 15Oct 20Oct 24Oct 26Oct 29Nov 1Nov 2Nov 5Nov 11
32°FOct 29Nov 1Nov 3Nov 6Nov 9Nov 12Nov 14Nov 17Nov 22
28°FNov 8Nov 12Nov 15Nov 18Nov 21Nov 24Nov 27Dec 1Dec 5
24°FNov 16Nov 22Nov 26Nov 29Dec 1Dec 4Dec 7Dec 11Dec 18
20°FNov 27Dec 1Dec 4Dec 8Dec 11Dec 16Dec 19Dec 24Jan 1
16°FDec 6Dec 11Dec 16Dec 19Dec 23Dec 26Dec 31Jan 4Jan 12

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°F210205201197194190186181175
32°F235230225221218214211207201
28°F258252247243239236232227221
24°F278271266262258254250245239
20°F298290284280275271267262255
16°F318309304299294290285279273

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
5,545
Cooling degree days, base 65°F
802
Growing degree days, base 40°F
5,333
Growing degree days, base 45°F
4,109
Growing degree days, base 50°F
3,050
Growing degree days, base 55°F
2,145
Growing degree days, base 60°F
1,399

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,08602
February93001
March828112
April496478
May23429271
June50138539
July4284745
August5245705
September7191470
October3269183
November608038
December90805

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 6.4 km from Everett. 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 USW00014739 (Boston Logan Intl AP). Public domain.