Rindge climate

Rindge Frost Dates and Growing Season

NOAA 1991-2020 normals for Jaffrey Muni AP, 6 km from Rindge, elevation 1040 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Jaffrey 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 5 and the first fall freeze around October 6, a growing season of about 152 days.

Median at 36°F
last May 18, first September 26
Median at 32°F
last May 5, first October 6
Median at 28°F
last April 23, first October 20

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 31May 26May 24May 21May 18May 16May 13May 9May 4
32°FMay 20May 15May 11May 8May 5May 2Apr 30Apr 27Apr 23
28°FMay 6May 2Apr 29Apr 25Apr 23Apr 20Apr 17Apr 13Apr 8
24°FApr 21Apr 17Apr 13Apr 10Apr 8Apr 6Apr 4Apr 2Mar 29
20°FApr 9Apr 6Apr 4Apr 2Mar 31Mar 30Mar 27Mar 23Mar 18
16°FApr 4Apr 1Mar 30Mar 27Mar 24Mar 21Mar 18Mar 15Mar 11

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 13Sep 18Sep 21Sep 23Sep 26Sep 28Oct 1Oct 3Oct 7
32°FSep 25Sep 29Oct 1Oct 4Oct 6Oct 9Oct 12Oct 15Oct 22
28°FOct 4Oct 9Oct 13Oct 17Oct 20Oct 24Oct 28Nov 1Nov 5
24°FOct 18Oct 23Oct 28Oct 31Nov 2Nov 6Nov 9Nov 13Nov 18
20°FOct 31Nov 4Nov 8Nov 12Nov 15Nov 18Nov 21Nov 25Nov 30
16°FNov 11Nov 16Nov 20Nov 24Nov 27Nov 30Dec 2Dec 5Dec 11

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°F147141137134130127123119113
32°F171164160156152148145140134
28°F199192187182178174169164157
24°F226219214210206203200195188
20°F248242236232228224220215209
16°F268260256250246243239234226

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
7,172
Cooling degree days, base 65°F
424
Growing degree days, base 40°F
4,216
Growing degree days, base 45°F
3,175
Growing degree days, base 50°F
2,276
Growing degree days, base 55°F
1,513
Growing degree days, base 60°F
891

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,32400
February1,14100
March1,01206
April624242
May31015202
June8775439
July16165614
August32128561
September17837317
October506283
November806011
December1,13601

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 km from Rindge. 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 USW00054770 (Jaffrey Muni AP). Public domain.