Richlandtown climate

Richlandtown Frost Dates and Growing Season

NOAA 1991-2020 normals for Springtown 1 Nne, 11.8 km from Richlandtown, elevation 860 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Springtown 1 Nne. 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 22, a growing season of about 184 days.

Median at 36°F
last May 2, first October 10
Median at 32°F
last April 21, first October 22
Median at 28°F
last April 8, first November 3

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

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

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°F182175169165161157153148140
32°F205197193188184180175170163
28°F227220215212208205200195188
24°F251244239234230226221217210
20°F275267261256252247243238231
16°F297291284278273268263257249

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
5,824
Cooling degree days, base 65°F
698
Growing degree days, base 40°F
5,160
Growing degree days, base 45°F
3,973
Growing degree days, base 50°F
2,932
Growing degree days, base 55°F
2,037
Growing degree days, base 60°F
1,292

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,14402
February97401
March841119
April4738102
May21235298
June45133539
July5246707
August10196651
September9771427
October3787152
November668030
December98005

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 11.8 km from Richlandtown. 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 USC00368400 (Springtown 1 Nne). Public domain.