Warren climate

Warren Frost Dates and Growing Season

NOAA 1991-2020 normals for Wildwood, 9.6 km from Warren, elevation 200 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Wildwood. 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 March 6 and the first fall freeze around November 21, a growing season of about 261 days.

Median at 36°F
last March 23, first November 10
Median at 32°F
last March 6, first November 21
Median at 28°F
last February 16, first December 5

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°FApr 15Apr 7Apr 2Mar 29Mar 23Mar 17Mar 13Mar 8Feb 28
32°FMar 31Mar 21Mar 15Mar 11Mar 6Feb 28Feb 25Feb 18Feb 9
28°FMar 15Mar 7Feb 28Feb 23Feb 16Feb 8Feb 1Jan 27Jan 15
24°FMar 4Feb 19Feb 7Feb 1Jan 29Jan 22Jan 15Jan 6Dec 26
20°FFeb 15Feb 3Jan 30Jan 24Jan 19Jan 14Jan 7Jan 1Dec 24
16°FFeb 1Jan 29Jan 22Jan 19Jan 11Jan 8Jan 5Jan 2Dec 27

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 27Nov 1Nov 3Nov 6Nov 10Nov 14Nov 18Nov 24Dec 1
32°FNov 3Nov 7Nov 12Nov 16Nov 21Nov 25Dec 1Dec 4Dec 10
28°FNov 12Nov 20Nov 26Dec 1Dec 5Dec 9Dec 17Dec 26Jan 4
24°FNov 28Dec 5Dec 12Dec 21Dec 29Jan 2Jan 8Jan 16Feb 1
20°FDec 15Dec 23Dec 31Jan 2Jan 6Jan 12Jan 18Jan 27Feb 3
16°FDec 24Jan 1Jan 3Jan 5Jan 9Jan 12Jan 20Jan 25Feb 1

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°F262252245239233228222215207
32°F291282274266261254249241232
28°F332320309300294286278269259
24°F365365354343334329318307295
20°F365365365365365365359349334
16°F365365365365365365365365365

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
99% of years
24°F or colder
83% of years
20°F or colder
39% of years
16°F or colder
11% 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
1,691
Cooling degree days, base 65°F
2,818
Growing degree days, base 40°F
10,278
Growing degree days, base 45°F
8,527
Growing degree days, base 50°F
6,881
Growing degree days, base 55°F
5,368
Growing degree days, base 60°F
4,011

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January4619118
February32313165
March17955356
April56131526
May6325784
June0487937
July05771,042
August05721,037
September0411861
October40174598
November21144302
December41520155

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 9.6 km from Warren. 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 USC00419754 (Wildwood). Public domain.