Earlville climate

Earlville Frost Dates and Growing Season

NOAA 1991-2020 normals for Manchester #2, 14.8 km from Earlville, elevation 990 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Manchester #2. 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 May 3 and the first fall freeze around October 4, a growing season of about 154 days.

Median at 36°F
last May 12, first September 26
Median at 32°F
last May 3, first October 4
Median at 28°F
last April 23, first October 15

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 25May 21May 18May 15May 12May 9May 7May 4Apr 29
32°FMay 16May 12May 9May 6May 3Apr 30Apr 28Apr 24Apr 18
28°FMay 7May 3Apr 30Apr 26Apr 23Apr 20Apr 16Apr 12Apr 7
24°FApr 29Apr 23Apr 19Apr 14Apr 11Apr 8Apr 5Apr 2Mar 29
20°FApr 16Apr 9Apr 6Apr 3Apr 1Mar 30Mar 25Mar 20Mar 14
16°FApr 6Apr 1Mar 29Mar 24Mar 21Mar 18Mar 15Mar 11Mar 7

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 14Sep 17Sep 20Sep 23Sep 26Sep 29Oct 1Oct 4Oct 7
32°FSep 22Sep 26Sep 30Oct 2Oct 4Oct 7Oct 10Oct 12Oct 17
28°FOct 2Oct 6Oct 10Oct 13Oct 15Oct 18Oct 20Oct 24Oct 28
24°FOct 12Oct 17Oct 20Oct 23Oct 26Oct 28Oct 30Nov 1Nov 6
20°FOct 23Oct 27Oct 30Nov 1Nov 3Nov 6Nov 9Nov 14Nov 20
16°FNov 1Nov 4Nov 7Nov 10Nov 14Nov 16Nov 21Nov 25Dec 1

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°F154147143139135131128124117
32°F174167162159154151147142136
28°F194188183179174170166161153
24°F217210205201197193188182173
20°F239231226221217213208203194
16°F260252247242237232227222215

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
7,392
Cooling degree days, base 65°F
617
Growing degree days, base 40°F
4,639
Growing degree days, base 45°F
3,590
Growing degree days, base 50°F
2,660
Growing degree days, base 55°F
1,851
Growing degree days, base 60°F
1,164

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,48300
February1,22400
March969014
April564370
May24737281
June41141551
July11214668
August25157597
September16157356
October4977110
November888012
December1,28301

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 14.8 km from Earlville. 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 USC00135086 (Manchester #2). Public domain.