North Hudson climate

North Hudson Frost Dates and Growing Season

NOAA 1991-2020 normals for Stillwater 1 Se, 6.3 km from North Hudson, elevation 710 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Stillwater 1 Se. 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 22 and the first fall freeze around October 19, a growing season of about 178 days.

Median at 36°F
last May 2, first October 8
Median at 32°F
last April 22, first October 19
Median at 28°F
last April 12, first October 30

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 17May 11May 7May 4May 2Apr 30Apr 27Apr 23Apr 19
32°FMay 6May 1Apr 28Apr 25Apr 22Apr 19Apr 15Apr 12Apr 7
28°FApr 27Apr 21Apr 18Apr 15Apr 12Apr 9Apr 6Apr 3Mar 31
24°FApr 18Apr 12Apr 8Apr 5Apr 3Apr 1Mar 30Mar 25Mar 19
20°FApr 9Apr 4Apr 2Mar 31Mar 28Mar 24Mar 20Mar 16Mar 11
16°FApr 3Mar 31Mar 27Mar 23Mar 20Mar 17Mar 14Mar 10Mar 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°FSep 25Sep 30Oct 3Oct 5Oct 8Oct 10Oct 14Oct 18Oct 23
32°FOct 3Oct 8Oct 13Oct 17Oct 19Oct 22Oct 26Oct 30Nov 3
28°FOct 15Oct 21Oct 24Oct 27Oct 30Nov 1Nov 4Nov 7Nov 11
24°FOct 26Oct 30Nov 1Nov 4Nov 6Nov 8Nov 11Nov 14Nov 19
20°FNov 1Nov 5Nov 8Nov 11Nov 14Nov 16Nov 19Nov 22Nov 27
16°FNov 7Nov 12Nov 15Nov 18Nov 20Nov 23Nov 26Nov 29Dec 3

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°F178170166161158154149144137
32°F200193187182178173169164157
28°F218211207203199195190186180
24°F234228223218215211207203196
20°F249244239235231226223218211
16°F264257252248244240236231223

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
6,928
Cooling degree days, base 65°F
927
Growing degree days, base 40°F
5,256
Growing degree days, base 45°F
4,172
Growing degree days, base 50°F
3,188
Growing degree days, base 55°F
2,317
Growing degree days, base 60°F
1,557

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,46000
February1,18300
March93909
April495797
May17255358
June26191615
July3305767
August6257716
September93103464
October42811144
November850017
December1,27400

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 6.3 km from North Hudson. 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 USC00218037 (Stillwater 1 Se). Public domain.