Beaver County climate

Beaver County Frost Dates and Growing Season

NOAA 1991-2020 normals for Beaver, 8.4 km from Beaver County, elevation 2465 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Beaver. 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 21 and the first fall freeze around October 21, a growing season of about 181 days.

Median at 36°F
last May 1, first October 11
Median at 32°F
last April 21, first October 21
Median at 28°F
last April 10, first October 29

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 13May 8May 6May 3May 1Apr 29Apr 26Apr 22Apr 18
32°FMay 4Apr 30Apr 28Apr 24Apr 21Apr 18Apr 15Apr 12Apr 7
28°FApr 27Apr 21Apr 17Apr 13Apr 10Apr 7Apr 5Apr 1Mar 25
24°FApr 18Apr 10Apr 6Apr 3Mar 31Mar 28Mar 24Mar 18Mar 12
20°FApr 8Apr 2Mar 30Mar 25Mar 19Mar 15Mar 11Mar 7Mar 2
16°FMar 31Mar 22Mar 15Mar 11Mar 7Mar 4Mar 1Feb 25Feb 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 28Oct 2Oct 6Oct 8Oct 11Oct 14Oct 17Oct 20Oct 24
32°FOct 6Oct 11Oct 15Oct 18Oct 21Oct 23Oct 26Oct 28Nov 1
28°FOct 16Oct 20Oct 24Oct 27Oct 29Nov 1Nov 3Nov 6Nov 9
24°FOct 24Oct 29Nov 1Nov 3Nov 6Nov 8Nov 11Nov 15Nov 19
20°FNov 1Nov 5Nov 8Nov 11Nov 15Nov 18Nov 21Nov 24Nov 29
16°FNov 7Nov 13Nov 17Nov 20Nov 24Nov 27Dec 1Dec 5Dec 10

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°F181174170166163159155151146
32°F201194189185181177172168161
28°F220213208203199195190185179
24°F240232227222218214208203195
20°F263255248243238233228222214
16°F286276271264259255249242233

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
4,674
Cooling degree days, base 65°F
1,600
Growing degree days, base 40°F
6,844
Growing degree days, base 45°F
5,508
Growing degree days, base 50°F
4,323
Growing degree days, base 55°F
3,280
Growing degree days, base 60°F
2,374

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January97502
February790012
March593482
April32420209
May107113477
June8317759
July1479942
August2427890
September42207617
October26534273
November621156
December94704

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 8.4 km from Beaver County. 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 USC00340593 (Beaver). Public domain.