Danvers climate

Danvers Frost Dates and Growing Season

NOAA 1991-2020 normals for Beverly Muni AP, 1.4 km from Danvers, elevation 108 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Beverly 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 April 24 and the first fall freeze around October 17, a growing season of about 177 days.

Median at 36°F
last May 6, first October 5
Median at 32°F
last April 24, first October 17
Median at 28°F
last April 9, first November 1

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 21May 15May 12May 8May 6May 4May 2Apr 29Apr 25
32°FMay 6May 2Apr 29Apr 26Apr 24Apr 21Apr 19Apr 16Apr 11
28°FApr 23Apr 19Apr 16Apr 13Apr 9Apr 7Apr 5Apr 2Mar 30
24°FApr 9Apr 6Apr 3Apr 1Mar 31Mar 28Mar 25Mar 21Mar 15
20°FApr 1Mar 29Mar 25Mar 22Mar 19Mar 16Mar 13Mar 11Mar 5
16°FMar 25Mar 20Mar 16Mar 14Mar 11Mar 9Mar 6Mar 1Feb 25

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 24Sep 29Oct 1Oct 3Oct 5Oct 8Oct 10Oct 14Oct 20
32°FOct 3Oct 7Oct 11Oct 14Oct 17Oct 21Oct 24Oct 28Nov 2
28°FOct 16Oct 21Oct 25Oct 28Nov 1Nov 3Nov 7Nov 11Nov 15
24°FOct 29Nov 2Nov 6Nov 9Nov 12Nov 15Nov 19Nov 23Nov 30
20°FNov 12Nov 17Nov 21Nov 25Nov 28Dec 1Dec 4Dec 7Dec 13
16°FNov 27Dec 1Dec 4Dec 6Dec 10Dec 13Dec 17Dec 22Dec 27

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°F170164159155151147143139133
32°F197189185181177173169163157
28°F221215210206203200196190183
24°F247241237232227223219215208
20°F274267261256253248244238231
16°F298289283278274270266260253

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
6,103
Cooling degree days, base 65°F
611
Growing degree days, base 40°F
4,829
Growing degree days, base 45°F
3,668
Growing degree days, base 50°F
2,667
Growing degree days, base 55°F
1,827
Growing degree days, base 60°F
1,142

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,14801
February98701
March881012
April550459
May27920225
June73101479
July8225682
August14189640
September11766401
October4036133
November671029
December97304

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 1.4 km from Danvers. 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 USW00054733 (Beverly Muni AP). Public domain.