Warren climate

Warren Frost Dates and Growing Season

NOAA 1991-2020 normals for Stockton 3 Nne, 10.7 km from Warren, elevation 970 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Stockton 3 Nne. 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 27 and the first fall freeze around October 9, a growing season of about 165 days.

Median at 36°F
last May 6, first September 29
Median at 32°F
last April 27, first October 9
Median at 28°F
last April 17, first October 21

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 17May 13May 9May 6May 4May 1Apr 28Apr 24
32°FMay 12May 7May 3Apr 30Apr 27Apr 24Apr 21Apr 18Apr 12
28°FMay 2Apr 26Apr 23Apr 20Apr 17Apr 14Apr 10Apr 7Apr 3
24°FApr 22Apr 17Apr 13Apr 9Apr 6Apr 3Apr 2Mar 30Mar 22
20°FApr 13Apr 6Apr 2Apr 1Mar 29Mar 25Mar 21Mar 16Mar 12
16°FApr 1Mar 28Mar 23Mar 20Mar 16Mar 14Mar 10Mar 7Mar 2

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 16Sep 21Sep 24Sep 27Sep 29Oct 1Oct 4Oct 7Oct 12
32°FSep 26Sep 30Oct 3Oct 6Oct 9Oct 12Oct 15Oct 18Oct 23
28°FOct 6Oct 12Oct 15Oct 18Oct 21Oct 23Oct 27Oct 30Nov 4
24°FOct 19Oct 23Oct 27Oct 30Nov 1Nov 3Nov 6Nov 11Nov 17
20°FNov 1Nov 3Nov 6Nov 9Nov 12Nov 16Nov 18Nov 22Nov 27
16°FNov 7Nov 12Nov 16Nov 19Nov 22Nov 24Nov 27Dec 1Dec 6

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°F162156152148144141137132124
32°F184177172168165161157151145
28°F206199193189185181177173165
24°F232224218212208204199194187
20°F253245239235232227223216209
16°F270263258253248245240235228

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
6,869
Cooling degree days, base 65°F
654
Growing degree days, base 40°F
4,870
Growing degree days, base 45°F
3,777
Growing degree days, base 50°F
2,807
Growing degree days, base 55°F
1,959
Growing degree days, base 60°F
1,235

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,39600
February1,14901
March901119
April516586
May21050321
June33153570
July9211666
August19160606
September13566387
October4478131
November830017
December1,22301

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 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 USC00118293 (Stockton 3 Nne). Public domain.