Hudson climate

Hudson Frost Dates and Growing Season

NOAA 1991-2020 normals for Hudson 1 Sse, 2.9 km from Hudson, elevation 185 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Hudson 1 Sse. 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 3 and the first fall freeze around October 8, a growing season of about 156 days.

Median at 36°F
last May 13, first September 30
Median at 32°F
last May 3, first October 8
Median at 28°F
last April 22, first October 18

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

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

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°F153148144141138134130127120
32°F175168163159156153150146140
28°F199192187183179175171166160
24°F223216212208204200195190184
20°F248241235230225221217213207
16°F270262258253249245240235228

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
6,815
Cooling degree days, base 65°F
625
Growing degree days, base 40°F
4,635
Growing degree days, base 45°F
3,564
Growing degree days, base 50°F
2,631
Growing degree days, base 55°F
1,826
Growing degree days, base 60°F
1,156

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,29601
February1,12000
March96707
April573359
May26425246
June63112500
July7233691
August16185634
September13863380
October480497
November786014
December1,10701

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 2.9 km from Hudson. 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 USC00274234 (Hudson 1 Sse). Public domain.