White Hall climate

White Hall Frost Dates and Growing Season

NOAA 1991-2020 normals for Selma 6 Sse, 25.1 km from White Hall, elevation 157 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Selma 6 Sse. 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 March 21 and the first fall freeze around November 7, a growing season of about 233 days.

Median at 36°F
last April 6, first October 31
Median at 32°F
last March 21, first November 7
Median at 28°F
last March 3, first November 20

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°FApr 21Apr 16Apr 12Apr 9Apr 6Apr 2Mar 29Mar 25Mar 17
32°FApr 12Apr 4Mar 31Mar 26Mar 21Mar 17Mar 13Mar 6Feb 27
28°FMar 24Mar 17Mar 12Mar 9Mar 3Feb 28Feb 24Feb 16Feb 5
24°FMar 12Mar 4Feb 28Feb 22Feb 16Feb 9Feb 3Jan 28Jan 20
20°FMar 2Feb 19Feb 12Feb 5Jan 31Jan 28Jan 22Jan 14Jan 2
16°FFeb 15Feb 6Feb 1Jan 29Jan 25Jan 20Jan 15Jan 8Dec 30

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 17Oct 21Oct 24Oct 28Oct 31Nov 1Nov 4Nov 7Nov 13
32°FOct 25Oct 30Nov 1Nov 4Nov 7Nov 11Nov 15Nov 20Nov 27
28°FNov 3Nov 9Nov 12Nov 16Nov 20Nov 25Dec 1Dec 5Dec 16
24°FNov 13Nov 21Nov 29Dec 2Dec 7Dec 14Dec 26Jan 1Jan 13
20°FNov 27Dec 4Dec 13Dec 25Jan 1Jan 4Jan 11Jan 20Feb 3
16°FDec 12Dec 29Jan 2Jan 7Jan 13Jan 18Jan 24Jan 29Feb 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°F232225219213209203198193185
32°F264252245238233228222216206
28°F296284276269262255248242234
24°F335324312304296289280271258
20°F365357344335331322314305292
16°F365365365365362352342334320

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
99% of years
20°F or colder
89% of years
16°F or colder
55% 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
2,367
Cooling degree days, base 65°F
2,086
Growing degree days, base 40°F
8,945
Growing degree days, base 45°F
7,282
Growing degree days, base 50°F
5,742
Growing degree days, base 55°F
4,350
Growing degree days, base 60°F
3,130

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January595279
February4176117
March27517241
April11457396
May19225671
June0395844
July0494959
August0474939
September4303748
October10195462
November33413175
December5095110

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 25.1 km from White Hall. 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 USW00063897 (Selma 6 Sse). Public domain.