Sharon climate

Sharon Frost Dates and Growing Season

NOAA 1991-2020 normals for Clinton Wwtp, 13.1 km from Sharon, elevation 924 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Clinton Wwtp. 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 10, a growing season of about 161 days.

Median at 36°F
last May 11, first October 1
Median at 32°F
last April 30, first October 10
Median at 28°F
last April 19, first October 20

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

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 18Sep 22Sep 26Sep 28Oct 1Oct 2Oct 5Oct 8Oct 13
32°FSep 26Oct 1Oct 4Oct 7Oct 10Oct 13Oct 15Oct 19Oct 24
28°FOct 5Oct 10Oct 14Oct 16Oct 20Oct 22Oct 25Oct 28Nov 1
24°FOct 14Oct 21Oct 24Oct 27Oct 30Nov 1Nov 5Nov 9Nov 14
20°FOct 26Oct 31Nov 3Nov 6Nov 10Nov 13Nov 16Nov 20Nov 25
16°FNov 4Nov 9Nov 14Nov 18Nov 21Nov 24Nov 27Dec 1Dec 7

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°F161154150146142138134129123
32°F180174169164161157152147141
28°F202196191187183178174169161
24°F227218213209205201196190182
20°F251243238233229224219214207
16°F269262258253249244240234227

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
7,156
Cooling degree days, base 65°F
618
Growing degree days, base 40°F
4,693
Growing degree days, base 45°F
3,628
Growing degree days, base 50°F
2,687
Growing degree days, base 55°F
1,867
Growing degree days, base 60°F
1,171

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,43200
February1,17500
March950117
April555374
May25137278
June45138543
July12210663
August21159603
September13964382
October4857113
November849014
December1,24501

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 13.1 km from Sharon. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00471667 (Clinton Wwtp). Public domain.