Irvington climate

Irvington Frost Dates and Growing Season

NOAA 1991-2020 normals for Corners, 10.7 km from Irvington, elevation 615 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Corners. 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 25 and the first fall freeze around October 16, a growing season of about 172 days.

Median at 36°F
last May 3, first October 8
Median at 32°F
last April 25, first October 16
Median at 28°F
last April 14, 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°FMay 21May 16May 11May 7May 3Apr 30Apr 28Apr 25Apr 20
32°FMay 12May 6May 1Apr 28Apr 25Apr 22Apr 19Apr 16Apr 11
28°FApr 28Apr 23Apr 19Apr 17Apr 14Apr 12Apr 9Apr 5Mar 31
24°FApr 16Apr 11Apr 6Apr 3Apr 1Mar 30Mar 26Mar 21Mar 15
20°FApr 4Mar 31Mar 27Mar 23Mar 20Mar 16Mar 13Mar 8Mar 1
16°FMar 24Mar 19Mar 14Mar 11Mar 8Mar 4Feb 28Feb 24Feb 17

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

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°F173167163159155152148143136
32°F192186180177172168164160154
28°F213207202199194190186181173
24°F240231225221217211207203195
20°F267257250244240235230225217
16°F293283276271265260254248239

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
4,932
Cooling degree days, base 65°F
1,090
Growing degree days, base 40°F
6,166
Growing degree days, base 45°F
4,858
Growing degree days, base 50°F
3,704
Growing degree days, base 55°F
2,698
Growing degree days, base 60°F
1,827

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,01808
February847118
March668161
April35017190
May12583430
June12216654
July2325787
August3280742
September57141534
October31726219
November642146
December891015

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 10.7 km from Irvington. 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 USC00151810 (Corners). Public domain.