Inwood climate

Inwood Frost Dates and Growing Season

NOAA 1991-2020 normals for Canton, 12.6 km from Inwood, elevation 1316 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Canton. 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 2 and the first fall freeze around October 2, a growing season of about 151 days.

Median at 36°F
last May 12, first September 25
Median at 32°F
last May 2, first October 2
Median at 28°F
last April 23, first October 11

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

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°F153147142139135132128123117
32°F170164159155151147144139133
28°F190183178175171167163157151
24°F208202197193190184180176169
20°F227220215211207203199194188
16°F244237232227223219215210203

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
7,684
Cooling degree days, base 65°F
679
Growing degree days, base 40°F
4,690
Growing degree days, base 45°F
3,652
Growing degree days, base 50°F
2,727
Growing degree days, base 55°F
1,919
Growing degree days, base 60°F
1,233

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,53300
February1,24401
March997114
April573573
May24940284
June38158570
July9243699
August23165608
September15563368
October5266101
November95309
December1,38400

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 12.6 km from Inwood. 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 USC00391392 (Canton). Public domain.