Jeromesville climate

Jeromesville Frost Dates and Growing Season

NOAA 1991-2020 normals for Wooster Exp Station, 23.6 km from Jeromesville, elevation 1020 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Wooster Exp Station. 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 30 and the first fall freeze around October 12, a growing season of about 163 days.

Median at 36°F
last May 12, first October 3
Median at 32°F
last April 30, first October 12
Median at 28°F
last April 20, first October 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°FMay 28May 24May 19May 15May 12May 8May 5May 1Apr 26
32°FMay 18May 12May 8May 4Apr 30Apr 28Apr 25Apr 22Apr 17
28°FMay 5Apr 30Apr 26Apr 23Apr 20Apr 17Apr 14Apr 9Apr 5
24°FApr 22Apr 17Apr 13Apr 9Apr 6Apr 3Apr 1Mar 29Mar 23
20°FApr 11Apr 4Apr 1Mar 30Mar 27Mar 24Mar 20Mar 17Mar 11
16°FMar 31Mar 28Mar 23Mar 20Mar 16Mar 13Mar 10Mar 5Feb 28

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

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°F162155151146141137133128121
32°F183177171167163159154149141
28°F208201195191186182177171163
24°F238229224219215210205199191
20°F261252247242238233228223216
16°F284276270264260255250243235

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
6,045
Cooling degree days, base 65°F
693
Growing degree days, base 40°F
5,136
Growing degree days, base 45°F
3,965
Growing degree days, base 50°F
2,933
Growing degree days, base 55°F
2,041
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
January1,18903
February1,00504
March845128
April4716112
May20648321
June43149557
July6225684
August13185637
September11170413
October41110143
November719028
December1,02605

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 23.6 km from Jeromesville. 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 USC00339312 (Wooster Exp Station). Public domain.