Brielle climate

Brielle Frost Dates and Growing Season

NOAA 1991-2020 normals for Long Branch-Oakhurst, 21.5 km from Brielle, elevation 30 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Long Branch-Oakhurst. 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 3, a growing season of about 208 days.

Median at 36°F
last April 22, first October 24
Median at 32°F
last April 9, first November 3
Median at 28°F
last March 29, first November 15

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 8May 2Apr 29Apr 26Apr 22Apr 19Apr 17Apr 14Apr 8
32°FApr 23Apr 19Apr 16Apr 12Apr 9Apr 6Apr 3Apr 1Mar 28
28°FApr 10Apr 5Apr 3Mar 31Mar 29Mar 25Mar 21Mar 18Mar 13
24°FMar 31Mar 26Mar 22Mar 19Mar 16Mar 13Mar 9Mar 5Feb 27
20°FMar 22Mar 17Mar 13Mar 9Mar 5Mar 2Feb 28Feb 21Feb 14
16°FMar 11Mar 5Mar 1Feb 25Feb 20Feb 16Feb 11Feb 4Jan 30

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 11Oct 15Oct 18Oct 21Oct 24Oct 27Oct 29Nov 1Nov 6
32°FOct 21Oct 26Oct 30Nov 1Nov 3Nov 7Nov 9Nov 13Nov 18
28°FNov 1Nov 5Nov 9Nov 12Nov 15Nov 18Nov 22Nov 27Dec 2
24°FNov 13Nov 19Nov 23Nov 27Nov 30Dec 2Dec 6Dec 12Dec 19
20°FNov 25Dec 1Dec 6Dec 10Dec 14Dec 19Dec 24Dec 29Jan 4
16°FDec 9Dec 17Dec 23Dec 28Jan 1Jan 4Jan 8Jan 15Jan 24

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°F203197192188184180175170163
32°F228220215211208204200195189
28°F256248242237233228224218211
24°F282274267262258254249242235
20°F309301294289284279273267259
16°F333325318312307303298292284

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
4,986
Cooling degree days, base 65°F
913
Growing degree days, base 40°F
5,736
Growing degree days, base 45°F
4,435
Growing degree days, base 50°F
3,314
Growing degree days, base 55°F
2,358
Growing degree days, base 60°F
1,558

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January98302
February85402
March752018
April456592
May20031301
June31161580
July1315780
August1268732
September45121527
October28512214
November557056
December823011

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 21.5 km from Brielle. 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 USC00284987 (Long Branch-Oakhurst). Public domain.