Many climate

Many Frost Dates and Growing Season

NOAA 1991-2020 normals for Many, 0.9 km from Many, elevation 255 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Many. 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 20 and the first fall freeze around November 9, a growing season of about 236 days.

Median at 36°F
last April 3, first November 1
Median at 32°F
last March 20, first November 9
Median at 28°F
last March 6, first November 24

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 24Apr 17Apr 12Apr 8Apr 3Mar 31Mar 27Mar 22Mar 14
32°FApr 9Apr 2Mar 29Mar 25Mar 20Mar 15Mar 11Mar 5Feb 26
28°FMar 27Mar 20Mar 15Mar 11Mar 6Mar 2Feb 26Feb 19Feb 6
24°FMar 15Mar 7Mar 2Feb 25Feb 16Feb 7Jan 31Jan 24Jan 13
20°FMar 5Feb 23Feb 10Feb 2Jan 29Jan 21Jan 14Jan 5Dec 26
16°FFeb 26Feb 6Feb 1Jan 23Jan 17Jan 10Jan 4Dec 31Dec 20

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 18Oct 22Oct 26Oct 29Nov 1Nov 3Nov 6Nov 10Nov 17
32°FOct 26Oct 31Nov 3Nov 5Nov 9Nov 14Nov 18Nov 25Dec 4
28°FNov 1Nov 7Nov 14Nov 20Nov 24Dec 1Dec 5Dec 11Dec 25
24°FNov 12Nov 23Nov 30Dec 4Dec 10Dec 22Dec 31Jan 5Jan 17
20°FNov 28Dec 7Dec 20Dec 30Jan 3Jan 8Jan 16Jan 25Feb 5
16°FDec 15Dec 26Jan 1Jan 6Jan 10Jan 17Jan 25Feb 1Feb 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°F236228221215210205200194187
32°F265255248242236230225218208
28°F299288280272265257250243232
24°F343327316308302294285275262
20°F365365363354343334325312300
16°F365365365365365365365355334

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
97% of years
20°F or colder
72% of years
16°F or colder
32% 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
2,323
Cooling degree days, base 65°F
2,204
Growing degree days, base 40°F
9,087
Growing degree days, base 45°F
7,403
Growing degree days, base 50°F
5,855
Growing degree days, base 55°F
4,468
Growing degree days, base 60°F
3,244

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January570265
February4265101
March27421245
April11775412
May16230679
June0404853
July0519984
August0494959
September6333777
October93103480
November30114208
December520492

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 0.9 km from Many. 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 USC00165892 (Many). Public domain.