Frewsburg climate

Frewsburg Frost Dates and Growing Season

NOAA 1991-2020 normals for Jamestown 4 Ene, 6.1 km from Frewsburg, elevation 1250 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Jamestown 4 Ene. 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 13, a growing season of about 158 days.

Median at 36°F
last May 20, first October 1
Median at 32°F
last May 8, first October 13
Median at 28°F
last April 25, first October 28

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 2May 30May 26May 23May 20May 17May 13May 9May 4
32°FMay 25May 20May 15May 11May 8May 4Apr 30Apr 28Apr 22
28°FMay 13May 7May 2Apr 28Apr 25Apr 22Apr 18Apr 15Apr 9
24°FApr 27Apr 21Apr 17Apr 13Apr 9Apr 6Apr 4Apr 1Mar 27
20°FApr 10Apr 5Apr 3Apr 1Mar 30Mar 27Mar 24Mar 20Mar 15
16°FApr 2Mar 30Mar 26Mar 23Mar 20Mar 18Mar 16Mar 13Mar 8

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 19Sep 24Sep 27Sep 29Oct 1Oct 3Oct 6Oct 9Oct 14
32°FOct 1Oct 4Oct 7Oct 10Oct 13Oct 17Oct 20Oct 24Oct 30
28°FOct 10Oct 16Oct 21Oct 25Oct 28Oct 31Nov 2Nov 6Nov 12
24°FOct 26Nov 1Nov 3Nov 6Nov 9Nov 12Nov 16Nov 19Nov 27
20°FNov 5Nov 11Nov 15Nov 19Nov 22Nov 27Dec 1Dec 4Dec 11
16°FNov 15Nov 22Nov 27Dec 1Dec 3Dec 7Dec 11Dec 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°F154147142139135131126121114
32°F179171166162158153148144136
28°F208200195189184179174168160
24°F236228222217212208204198190
20°F260254248242238234230224216
16°F280273266262258253248242234

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
6,848
Cooling degree days, base 65°F
420
Growing degree days, base 40°F
4,396
Growing degree days, base 45°F
3,307
Growing degree days, base 50°F
2,365
Growing degree days, base 55°F
1,563
Growing degree days, base 60°F
907

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,26301
February1,11401
March983011
April589260
May28826239
June8184455
July24143584
August32118550
September15643343
October4694103
November771016
December1,07902

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 6.1 km from Frewsburg. 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 USC00304207 (Jamestown 4 Ene). Public domain.