Earlville climate

Earlville Frost Dates and Growing Season

NOAA 1991-2020 normals for Sherburne, 7.7 km from Earlville, elevation 1095 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Sherburne. 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 13 and the first fall freeze around October 4, a growing season of about 145 days.

Median at 36°F
last May 25, first September 25
Median at 32°F
last May 13, first October 4
Median at 28°F
last April 30, first October 18

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°FJun 6Jun 1May 30May 27May 25May 22May 18May 14May 9
32°FMay 28May 24May 19May 16May 13May 10May 6May 2Apr 27
28°FMay 17May 11May 7May 4Apr 30Apr 29Apr 25Apr 22Apr 17
24°FMay 5Apr 30Apr 25Apr 22Apr 19Apr 15Apr 11Apr 7Apr 3
20°FApr 20Apr 15Apr 11Apr 7Apr 5Apr 3Apr 1Mar 29Mar 24
16°FApr 10Apr 5Apr 3Apr 1Mar 30Mar 28Mar 24Mar 20Mar 15

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 12Sep 17Sep 20Sep 22Sep 25Sep 27Sep 30Oct 2Oct 7
32°FSep 22Sep 27Sep 30Oct 2Oct 4Oct 7Oct 11Oct 16Oct 20
28°FOct 1Oct 6Oct 10Oct 14Oct 18Oct 21Oct 25Oct 30Nov 4
24°FOct 12Oct 19Oct 24Oct 29Nov 1Nov 3Nov 6Nov 9Nov 15
20°FOct 29Nov 2Nov 5Nov 9Nov 11Nov 14Nov 17Nov 21Nov 27
16°FNov 8Nov 13Nov 16Nov 20Nov 23Nov 26Nov 29Dec 2Dec 8

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°F140135130125122118114109103
32°F166159153149145141137132123
28°F191184178174169165160155148
24°F215208204200195191186180171
20°F239231227223219215211206198
16°F257250245241237233230225218

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
7,353
Cooling degree days, base 65°F
393
Growing degree days, base 40°F
4,179
Growing degree days, base 45°F
3,140
Growing degree days, base 50°F
2,239
Growing degree days, base 55°F
1,472
Growing degree days, base 60°F
849

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,34201
February1,17900
March1,06506
April646247
May31221217
June9578435
July27139577
August40111536
September18339315
October507391
November815014
December1,14402

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 7.7 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 USC00307705 (Sherburne). Public domain.