Bergholz climate

Bergholz Frost Dates and Growing Season

NOAA 1991-2020 normals for New Cumberland L/d, 21.7 km from Bergholz, elevation 675 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for New Cumberland L/d. 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 22 and the first fall freeze around October 28, a growing season of about 186 days.

Median at 36°F
last May 2, first October 17
Median at 32°F
last April 22, first October 28
Median at 28°F
last April 10, first November 6

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 20May 13May 9May 5May 2Apr 30Apr 27Apr 23Apr 20
32°FMay 8May 1Apr 28Apr 25Apr 22Apr 19Apr 17Apr 15Apr 11
28°FApr 21Apr 18Apr 16Apr 13Apr 10Apr 7Apr 4Apr 2Mar 30
24°FApr 13Apr 8Apr 5Apr 2Apr 1Mar 30Mar 26Mar 22Mar 17
20°FApr 3Mar 31Mar 27Mar 24Mar 21Mar 18Mar 15Mar 11Mar 6
16°FMar 25Mar 21Mar 18Mar 14Mar 11Mar 8Mar 4Feb 28Feb 21

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

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°F184179175170167163157153146
32°F204198194190186182179173166
28°F227222217213209206203198192
24°F251245239234230226222218212
20°F277269262257250247242236229
16°F301293287281277271265259251

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
5,556
Cooling degree days, base 65°F
804
Growing degree days, base 40°F
5,476
Growing degree days, base 45°F
4,258
Growing degree days, base 50°F
3,185
Growing degree days, base 55°F
2,250
Growing degree days, base 60°F
1,452

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,12002
February94903
March807126
April4304125
May17844341
June29152573
July2264727
August4234694
September6794478
October34412181
November659031
December96704

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 21.7 km from Bergholz. 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 USC00466442 (New Cumberland L/d). Public domain.