Clyde climate

Clyde Frost Dates and Growing Season

NOAA 1991-2020 normals for Waynesville 1 E, 7.3 km from Clyde, elevation 2658 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Waynesville 1 E. 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 30 and the first fall freeze around October 14, a growing season of about 167 days.

Median at 36°F
last May 11, first October 6
Median at 32°F
last April 30, first October 14
Median at 28°F
last April 16, first October 22

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

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 23Sep 28Oct 1Oct 4Oct 6Oct 9Oct 11Oct 13Oct 18
32°FOct 4Oct 7Oct 10Oct 13Oct 14Oct 16Oct 19Oct 22Oct 26
28°FOct 11Oct 15Oct 18Oct 20Oct 22Oct 24Oct 27Nov 1Nov 4
24°FOct 18Oct 23Oct 26Oct 30Nov 1Nov 3Nov 6Nov 10Nov 16
20°FOct 28Nov 1Nov 5Nov 8Nov 11Nov 14Nov 19Nov 25Dec 1
16°FNov 8Nov 14Nov 18Nov 24Nov 28Dec 1Dec 5Dec 11Dec 21

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°F167160155151147143140135129
32°F187180175172167163159154148
28°F211204199195191186182176169
24°F236228222218213209205200193
20°F265256248243238234228222216
16°F299287278271264258253247239

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
4,793
Cooling degree days, base 65°F
531
Growing degree days, base 40°F
5,502
Growing degree days, base 45°F
4,156
Growing degree days, base 50°F
2,990
Growing degree days, base 55°F
1,998
Growing degree days, base 60°F
1,174

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January92808
February750011
March643046
April3753148
May16424336
June29104525
July4185646
August6155614
September7754429
October3495173
November629040
December839015

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 7.3 km from Clyde. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00319147 (Waynesville 1 E). Public domain.