Weaverville climate

Weaverville Frost Dates and Growing Season

NOAA 1991-2020 normals for Weaverville, 0.6 km from Weaverville, elevation 2058 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Weaverville. 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 May 3 and the first fall freeze around October 11, a growing season of about 159 days.

Median at 36°F
last May 30, first September 28
Median at 32°F
last May 3, first October 11
Median at 28°F
last April 11, 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°FJun 18Jun 11Jun 6Jun 2May 30May 25May 20May 14May 7
32°FMay 27May 16May 11May 6May 3Apr 30Apr 27Apr 21Apr 16
28°FApr 30Apr 26Apr 20Apr 16Apr 11Apr 7Apr 3Mar 28Mar 20
24°FApr 12Apr 4Mar 29Mar 22Mar 15Mar 8Mar 1Feb 19Feb 1
20°FMar 7Feb 27Feb 18Feb 9Jan 29Jan 13Jan 3Dec 27Dec 11
16°FFeb 14Jan 31Jan 14Jan 3Dec 31Dec 22Dec 13Dec 6Nov 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°FSep 11Sep 16Sep 21Sep 25Sep 28Oct 1Oct 3Oct 7Oct 14
32°FSep 28Oct 1Oct 5Oct 8Oct 11Oct 15Oct 21Oct 26Nov 1
28°FOct 8Oct 14Oct 19Oct 25Oct 29Nov 1Nov 7Nov 14Nov 23
24°FOct 20Oct 29Nov 4Nov 10Nov 18Nov 24Dec 1Dec 9Dec 22
20°FNov 4Nov 15Nov 25Dec 1Dec 9Dec 16Dec 25Jan 4Jan 29
16°FNov 16Nov 30Dec 4Dec 11Dec 19Dec 26Jan 1Jan 12Feb 3

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°F14613713112511911410810295
32°F188178171165159153148140131
28°F232219211204198192186179168
24°F295276264252244236227219204
20°F361345333322313304294279257
16°F365365365365365354340331317

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
89% of years
16°F or colder
46% 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
4,358
Cooling degree days, base 65°F
740
Growing degree days, base 40°F
5,702
Growing degree days, base 45°F
4,270
Growing degree days, base 50°F
3,089
Growing degree days, base 55°F
2,124
Growing degree days, base 60°F
1,352

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January76401
February60907
March552039
April3961114
May20129302
June67105489
July6274733
August6230690
September5894487
October2927202
November590025
December81801

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 0.6 km from Weaverville. 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 USC00049490 (Weaverville). Public domain.