Conneaut climate

Conneaut Frost Dates and Growing Season

NOAA 1991-2020 normals for Springboro 3 Wnw, 18.1 km from Conneaut, elevation 1005 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Springboro 3 Wnw. 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 8 and the first fall freeze around October 16, a growing season of about 160 days.

Median at 36°F
last May 20, first October 2
Median at 32°F
last May 8, first October 16
Median at 28°F
last April 26, first November 1

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 1May 30May 26May 23May 20May 17May 13May 9May 2
32°FMay 23May 18May 14May 11May 8May 4Apr 30Apr 28Apr 23
28°FMay 14May 6May 1Apr 29Apr 26Apr 23Apr 20Apr 16Apr 9
24°FApr 26Apr 21Apr 18Apr 15Apr 12Apr 8Apr 5Apr 2Mar 29
20°FApr 14Apr 9Apr 5Apr 2Mar 31Mar 30Mar 26Mar 21Mar 16
16°FApr 3Mar 31Mar 28Mar 25Mar 22Mar 19Mar 16Mar 13Mar 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 17Sep 23Sep 27Sep 30Oct 2Oct 5Oct 8Oct 12Oct 18
32°FOct 1Oct 5Oct 9Oct 13Oct 16Oct 20Oct 23Oct 28Nov 2
28°FOct 13Oct 19Oct 25Oct 29Nov 1Nov 3Nov 6Nov 10Nov 16
24°FNov 1Nov 4Nov 7Nov 10Nov 13Nov 16Nov 20Nov 24Nov 30
20°FNov 9Nov 14Nov 18Nov 22Nov 26Nov 29Dec 3Dec 6Dec 13
16°FNov 18Nov 24Nov 29Dec 2Dec 6Dec 11Dec 14Dec 19Dec 25

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°F158150144140135131127121113
32°F183176170164160156151145136
28°F208201197191188183179172165
24°F238230225220214210206201194
20°F262255249244239235230225217
16°F282274268263258254250243235

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
6,777
Cooling degree days, base 65°F
435
Growing degree days, base 40°F
4,444
Growing degree days, base 45°F
3,348
Growing degree days, base 50°F
2,397
Growing degree days, base 55°F
1,586
Growing degree days, base 60°F
921

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,24801
February1,10702
March977016
April589367
May30025234
June8689455
July27149587
August37118546
September15345347
October4486118
November746021
December1,06004

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 18.1 km from Conneaut. 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 USC00368361 (Springboro 3 Wnw). Public domain.