Brusly climate

Brusly Frost Dates and Growing Season

NOAA 1991-2020 normals for Brusly 2 W, 1.7 km from Brusly, elevation 20 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Brusly 2 W. 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 February 28 and the first fall freeze around November 24, a growing season of about 268 days.

Median at 36°F
last March 17, first November 10
Median at 32°F
last February 28, first November 24
Median at 28°F
last February 8, first December 9

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°FApr 7Apr 1Mar 27Mar 21Mar 17Mar 12Mar 6Mar 1Feb 22
32°FMar 21Mar 14Mar 8Mar 3Feb 28Feb 24Feb 19Feb 10Jan 31
28°FMar 8Mar 1Feb 23Feb 16Feb 8Feb 2Jan 29Jan 20Jan 10
24°FFeb 21Feb 9Feb 2Jan 30Jan 25Jan 18Jan 10Jan 2Dec 22
20°FFeb 6Jan 31Jan 27Jan 21Jan 14Jan 10Jan 5Dec 31Dec 23
16°F–––––––––

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 27Nov 1Nov 4Nov 7Nov 10Nov 14Nov 18Nov 23Nov 28
32°FNov 6Nov 11Nov 16Nov 20Nov 24Nov 28Dec 1Dec 6Dec 17
28°FNov 17Nov 24Nov 30Dec 4Dec 9Dec 17Dec 25Jan 2Jan 13
24°FDec 1Dec 8Dec 16Dec 24Dec 30Jan 4Jan 9Jan 15Feb 1
20°FDec 18Dec 26Jan 1Jan 3Jan 7Jan 11Jan 17Jan 26Feb 1
16°F–––––––––

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°F268258251245240234228220211
32°F305291282274268262256249240
28°F340329320311304296289279267
24°F365365359350343336330321307
20°F365365365365365365363353338
16°F365365365365365365365365365

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
96% of years
24°F or colder
73% of years
20°F or colder
31% of years
16°F or colder
6% 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
1,693
Cooling degree days, base 65°F
2,563
Growing degree days, base 40°F
10,030
Growing degree days, base 45°F
8,285
Growing degree days, base 50°F
6,634
Growing degree days, base 55°F
5,121
Growing degree days, base 60°F
3,755

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January4499134
February30917177
March17150358
April66127513
May5295755
June0442892
July0521986
August0515980
September2380828
October60157565
November23335281
December39815167

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 1.7 km from Brusly. 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 USC00161246 (Brusly 2 W). Public domain.