Enhaut climate

Enhaut Frost Dates and Growing Season

NOAA 1991-2020 normals for Harrisburg Cptl Cy AP, 2.6 km from Enhaut, elevation 340 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Harrisburg Cptl Cy AP. 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 9 and the first fall freeze around November 1, a growing season of about 205 days.

Median at 36°F
last April 22, first October 20
Median at 32°F
last April 9, first November 1
Median at 28°F
last March 29, first November 12

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 10May 3Apr 30Apr 26Apr 22Apr 19Apr 17Apr 13Apr 9
32°FApr 25Apr 19Apr 16Apr 12Apr 9Apr 6Apr 4Apr 1Mar 27
28°FApr 9Apr 5Apr 2Mar 31Mar 29Mar 26Mar 22Mar 18Mar 13
24°FMar 30Mar 25Mar 21Mar 18Mar 15Mar 12Mar 9Mar 4Feb 27
20°FMar 21Mar 17Mar 13Mar 9Mar 6Mar 2Feb 27Feb 22Feb 16
16°FMar 14Mar 7Mar 3Feb 27Feb 23Feb 18Feb 13Feb 7Jan 29

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

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°F201193188184180176172166161
32°F225218214209205201196192182
28°F253245239235231227222216209
24°F279272266261257252247242235
20°F306298292286281275270265258
16°F333321314310306301296289280

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
99% 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
4,756
Cooling degree days, base 65°F
1,230
Growing degree days, base 40°F
6,312
Growing degree days, base 45°F
4,997
Growing degree days, base 50°F
3,840
Growing degree days, base 55°F
2,830
Growing degree days, base 60°F
1,958

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,00403
February84806
March675141
April34114176
May11683434
June10250690
July0387852
August1325789
September43148555
October27922236
November569049
December87008

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 2.6 km from Enhaut. 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 USW00014751 (Harrisburg Cptl Cy AP). Public domain.