Lyndhurst climate

Lyndhurst Frost Dates and Growing Season

NOAA 1991-2020 normals for Harrison, 7.5 km from Lyndhurst, elevation 24 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Harrison. 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 4 and the first fall freeze around November 6, a growing season of about 216 days.

Median at 36°F
last April 16, first October 27
Median at 32°F
last April 4, first November 6
Median at 28°F
last March 26, first November 19

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 2Apr 27Apr 23Apr 20Apr 16Apr 14Apr 11Apr 8Apr 4
32°FApr 16Apr 11Apr 8Apr 6Apr 4Apr 2Apr 1Mar 29Mar 23
28°FApr 5Apr 2Mar 31Mar 29Mar 26Mar 24Mar 20Mar 16Mar 11
24°FMar 29Mar 25Mar 22Mar 19Mar 16Mar 13Mar 9Mar 5Feb 28
20°FMar 23Mar 18Mar 14Mar 10Mar 7Mar 4Mar 1Feb 25Feb 18
16°FMar 13Mar 7Mar 3Feb 28Feb 25Feb 20Feb 14Feb 7Feb 2

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 12Oct 17Oct 21Oct 24Oct 27Oct 30Nov 1Nov 4Nov 9
32°FOct 25Oct 30Nov 1Nov 4Nov 6Nov 10Nov 13Nov 18Nov 22
28°FNov 5Nov 9Nov 12Nov 15Nov 19Nov 22Nov 26Dec 1Dec 5
24°FNov 15Nov 19Nov 24Nov 28Dec 1Dec 5Dec 9Dec 14Dec 21
20°FNov 27Dec 2Dec 7Dec 12Dec 16Dec 20Dec 24Dec 29Jan 4
16°FDec 9Dec 16Dec 22Dec 26Dec 30Jan 2Jan 6Jan 12Jan 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°F211204200196192189185180173
32°F237229224220216212208203197
28°F259250245241238233229225218
24°F285275270265259255251246238
20°F307299293288284278273267257
16°F331322315309304300295288281

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
4,896
Cooling degree days, base 65°F
1,219
Growing degree days, base 40°F
6,197
Growing degree days, base 45°F
4,900
Growing degree days, base 50°F
3,759
Growing degree days, base 55°F
2,769
Growing degree days, base 60°F
1,923

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,01803
February86204
March735025
April38912140
May13466399
June14236672
July0398863
August2336800
September38152564
October27718231
November567049
December86009

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 7.5 km from Lyndhurst. 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 USC00283704 (Harrison). Public domain.