New London climate

New London Frost Dates and Growing Season

NOAA 1991-2020 normals for Saverton L&d 22, 14.1 km from New London, elevation 472 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Saverton L&d 22. 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 4, a growing season of about 212 days.

Median at 36°F
last April 14, first October 24
Median at 32°F
last April 4, first November 4
Median at 28°F
last March 26, first November 14

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°FApr 30Apr 25Apr 21Apr 18Apr 14Apr 11Apr 8Apr 5Apr 2
32°FApr 19Apr 13Apr 9Apr 7Apr 4Apr 2Mar 31Mar 25Mar 20
28°FApr 8Apr 4Apr 1Mar 30Mar 26Mar 22Mar 18Mar 14Mar 8
24°FApr 2Mar 28Mar 23Mar 19Mar 15Mar 12Mar 8Mar 4Feb 28
20°FMar 24Mar 17Mar 13Mar 10Mar 6Mar 3Mar 1Feb 26Feb 19
16°FMar 16Mar 10Mar 7Mar 4Mar 1Feb 27Feb 21Feb 16Feb 6

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 12Oct 17Oct 20Oct 22Oct 24Oct 26Oct 29Nov 1Nov 5
32°FOct 23Oct 28Oct 31Nov 1Nov 4Nov 6Nov 9Nov 13Nov 18
28°FNov 1Nov 4Nov 8Nov 10Nov 14Nov 16Nov 20Nov 24Nov 30
24°FNov 7Nov 11Nov 15Nov 19Nov 22Nov 26Nov 30Dec 3Dec 9
20°FNov 14Nov 20Nov 25Nov 29Dec 1Dec 5Dec 9Dec 13Dec 19
16°FNov 23Nov 30Dec 3Dec 6Dec 11Dec 16Dec 20Dec 24Dec 30

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°F210204199195191187183179173
32°F234225220216212209205201194
28°F257248243238233229224219211
24°F276268261257252248243237229
20°F293284279274268263259253246
16°F310302295290285280275268261

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
5,027
Cooling degree days, base 65°F
1,434
Growing degree days, base 40°F
6,561
Growing degree days, base 45°F
5,276
Growing degree days, base 50°F
4,121
Growing degree days, base 55°F
3,099
Growing degree days, base 60°F
2,199

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,12303
February89508
March685355
April33118196
May101107473
June9296738
July0422887
August1377841
September45174580
October26433268
November604266
December96907

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 14.1 km from New London. 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 USC00237578 (Saverton L&d 22). Public domain.