Coram climate

Coram Frost Dates and Growing Season

NOAA 1991-2020 normals for Mt Sinai, 7.3 km from Coram, elevation 50 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Mt Sinai. 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 4 and the first fall freeze around November 7, a growing season of about 215 days.

Median at 36°F
last April 20, first October 26
Median at 32°F
last April 4, first November 7
Median at 28°F
last March 27, first November 22

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 7May 2Apr 27Apr 23Apr 20Apr 17Apr 14Apr 10Apr 6
32°FApr 19Apr 13Apr 10Apr 7Apr 4Apr 3Apr 1Mar 29Mar 23
28°FApr 7Apr 3Apr 1Mar 30Mar 27Mar 24Mar 20Mar 16Mar 11
24°FMar 31Mar 26Mar 23Mar 20Mar 16Mar 14Mar 11Mar 7Mar 1
20°FMar 22Mar 18Mar 14Mar 11Mar 8Mar 5Mar 1Feb 25Feb 15
16°FMar 15Mar 9Mar 5Mar 1Feb 25Feb 20Feb 13Feb 6Jan 28

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°FOct 10Oct 15Oct 18Oct 22Oct 26Oct 30Nov 2Nov 6Nov 10
32°FOct 20Oct 26Oct 30Nov 3Nov 7Nov 10Nov 14Nov 18Nov 24
28°FNov 2Nov 9Nov 14Nov 18Nov 22Nov 26Nov 30Dec 3Dec 9
24°FNov 18Nov 25Nov 30Dec 2Dec 6Dec 9Dec 13Dec 18Dec 24
20°FDec 1Dec 6Dec 10Dec 15Dec 19Dec 23Dec 27Jan 1Jan 8
16°FDec 10Dec 19Dec 25Dec 29Jan 1Jan 5Jan 10Jan 14Jan 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°F210203198192187183178173165
32°F236228223219215210205201195
28°F262255249245241236231225217
24°F288279274268264259255248240
20°F312303297292286281276270261
16°F333324317311306302297290281

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
99% 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
4,698
Cooling degree days, base 65°F
982
Growing degree days, base 40°F
6,086
Growing degree days, base 45°F
4,735
Growing degree days, base 50°F
3,534
Growing degree days, base 55°F
2,519
Growing degree days, base 60°F
1,672

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January97205
February83007
March731024
April3607145
May14336359
June24164589
July0319784
August1292756
September50139540
October27824237
November507173
December803017

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 7.3 km from Coram. 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 USC00305606 (Mt Sinai). Public domain.