Sangerville climate

Sangerville Frost Dates and Growing Season

NOAA 1991-2020 normals for E Sangerville, 6.7 km from Sangerville, elevation 635 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for E Sangerville. 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 6 and the first fall freeze around October 7, a growing season of about 153 days.

Median at 36°F
last May 20, first September 27
Median at 32°F
last May 6, first October 7
Median at 28°F
last April 25, first October 19

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°FJun 1May 28May 25May 22May 20May 17May 14May 11May 6
32°FMay 20May 16May 12May 9May 6May 3May 1Apr 28Apr 25
28°FMay 7May 2Apr 30Apr 27Apr 25Apr 22Apr 19Apr 16Apr 12
24°FApr 26Apr 22Apr 19Apr 16Apr 12Apr 9Apr 7Apr 5Apr 2
20°FApr 16Apr 11Apr 7Apr 6Apr 4Apr 2Apr 1Mar 29Mar 23
16°FApr 8Apr 5Apr 3Apr 1Mar 31Mar 28Mar 24Mar 20Mar 15

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 15Sep 19Sep 22Sep 24Sep 27Sep 29Oct 1Oct 4Oct 8
32°FSep 26Sep 30Oct 2Oct 4Oct 7Oct 9Oct 12Oct 16Oct 23
28°FOct 4Oct 9Oct 12Oct 16Oct 19Oct 23Oct 27Oct 31Nov 5
24°FOct 18Oct 23Oct 27Oct 31Nov 2Nov 5Nov 9Nov 12Nov 17
20°FNov 1Nov 5Nov 8Nov 11Nov 14Nov 17Nov 20Nov 24Nov 28
16°FNov 11Nov 15Nov 18Nov 21Nov 24Nov 27Nov 29Dec 2Dec 7

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°F146141136132129125121117111
32°F173166161157153149146142135
28°F199192187182178174169164157
24°F219214209206202198195190183
20°F240233229226222219215211205
16°F258251246242239235232228221

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
8,163
Cooling degree days, base 65°F
281
Growing degree days, base 40°F
3,736
Growing degree days, base 45°F
2,778
Growing degree days, base 50°F
1,946
Growing degree days, base 55°F
1,242
Growing degree days, base 60°F
680

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,49100
February1,28500
March1,12704
April732018
May3768150
June12839364
July27114552
August3690519
September20729282
October567153
November90204
December1,28600

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 6.7 km from Sangerville. 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 USC00172440 (E Sangerville). Public domain.