Pinconning climate

Pinconning Frost Dates and Growing Season

NOAA 1991-2020 normals for Standish 4NE, 18.4 km from Pinconning, elevation 615 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Standish 4NE. 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 10, a growing season of about 156 days.

Median at 36°F
last May 18, first September 29
Median at 32°F
last May 5, first October 10
Median at 28°F
last April 24, first October 25

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 29May 25May 21May 18May 15May 11May 7May 1
32°FMay 23May 17May 13May 8May 5May 2Apr 29Apr 26Apr 21
28°FMay 12May 3Apr 30Apr 28Apr 24Apr 22Apr 19Apr 14Apr 9
24°FApr 28Apr 22Apr 19Apr 16Apr 11Apr 8Apr 4Apr 2Mar 30
20°FApr 16Apr 9Apr 6Apr 3Apr 1Mar 31Mar 26Mar 21Mar 16
16°FApr 6Apr 2Mar 31Mar 27Mar 22Mar 19Mar 16Mar 12Mar 8

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 20Sep 24Sep 27Sep 29Oct 1Oct 4Oct 6Oct 11
32°FSep 26Oct 1Oct 4Oct 6Oct 10Oct 14Oct 16Oct 21Oct 27
28°FOct 7Oct 15Oct 19Oct 22Oct 25Oct 30Nov 1Nov 4Nov 9
24°FOct 24Oct 30Nov 1Nov 4Nov 7Nov 10Nov 14Nov 18Nov 23
20°FNov 5Nov 9Nov 13Nov 17Nov 20Nov 23Nov 26Dec 1Dec 6
16°FNov 13Nov 19Nov 24Nov 27Dec 1Dec 3Dec 7Dec 13Dec 18

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°F153146140136132128124119112
32°F178170166161156153148142134
28°F206197192187182178172166158
24°F232225219215210205201195186
20°F255247242238234230225220215
16°F276267261257252248244238231

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
7,391
Cooling degree days, base 65°F
422
Growing degree days, base 40°F
4,150
Growing degree days, base 45°F
3,134
Growing degree days, base 50°F
2,253
Growing degree days, base 55°F
1,502
Growing degree days, base 60°F
881

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,36100
February1,19800
March1,03707
April657240
May33123201
June8787451
July25155595
August37114542
September18037318
October505490
November82209
December1,15201

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 18.4 km from Pinconning. 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 USC00207820 (Standish 4NE). Public domain.