Webbers Falls climate

Webbers Falls Frost Dates and Growing Season

NOAA 1991-2020 normals for Webbers Falls 5 Wsw, 7.5 km from Webbers Falls, elevation 550 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Webbers Falls 5 Wsw. 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 6 and the first fall freeze around October 30, a growing season of about 206 days.

Median at 36°F
last April 18, first October 22
Median at 32°F
last April 6, first October 30
Median at 28°F
last March 25, first November 8

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

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 9Oct 14Oct 17Oct 19Oct 22Oct 24Oct 26Oct 29Nov 2
32°FOct 16Oct 20Oct 24Oct 27Oct 30Nov 1Nov 4Nov 7Nov 14
28°FOct 25Oct 30Nov 2Nov 5Nov 8Nov 11Nov 16Nov 22Nov 30
24°FNov 2Nov 6Nov 10Nov 15Nov 20Nov 25Dec 1Dec 4Dec 9
20°FNov 9Nov 17Nov 23Nov 29Dec 2Dec 5Dec 10Dec 17Dec 23
16°FNov 22Dec 1Dec 6Dec 11Dec 17Dec 23Dec 28Jan 2Jan 13

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°F205198193189185181177173166
32°F229221214210206201197191184
28°F258247241236230226220213206
24°F280272266260254248244237227
20°F307297290283278272267259249
16°F339329318311305299291281273

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
99% 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
3,561
Cooling degree days, base 65°F
1,945
Growing degree days, base 40°F
7,909
Growing degree days, base 45°F
6,418
Growing degree days, base 50°F
5,077
Growing degree days, base 55°F
3,885
Growing degree days, base 60°F
2,842

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January842016
February624136
March4499140
April20737302
May50143558
June2360808
July0530995
August0504968
September18288720
October16266384
November4578121
December750029

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 7.5 km from Webbers Falls. 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 USC00349445 (Webbers Falls 5 Wsw). Public domain.