North Lynbrook climate

North Lynbrook Frost Dates and Growing Season

NOAA 1991-2020 normals for Oceanside, 5.5 km from North Lynbrook, elevation 12 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Oceanside. 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 7 and the first fall freeze around November 8, a growing season of about 212 days.

Median at 36°F
last April 22, first October 29
Median at 32°F
last April 7, first November 8
Median at 28°F
last March 27, first November 21

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 7May 2Apr 29Apr 25Apr 22Apr 19Apr 16Apr 12Apr 7
32°FApr 26Apr 19Apr 15Apr 11Apr 7Apr 4Apr 2Mar 30Mar 24
28°FApr 9Apr 4Apr 2Mar 31Mar 27Mar 23Mar 19Mar 15Mar 10
24°FMar 31Mar 25Mar 20Mar 17Mar 14Mar 11Mar 8Mar 4Feb 27
20°FMar 21Mar 15Mar 10Mar 7Mar 4Mar 1Feb 26Feb 21Feb 14
16°FMar 7Mar 2Feb 27Feb 24Feb 18Feb 12Feb 7Feb 2Jan 27

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 14Oct 19Oct 23Oct 27Oct 29Nov 1Nov 3Nov 6Nov 11
32°FOct 27Nov 1Nov 3Nov 6Nov 8Nov 11Nov 14Nov 18Nov 23
28°FNov 7Nov 12Nov 15Nov 18Nov 21Nov 25Nov 29Dec 1Dec 7
24°FNov 18Nov 24Nov 28Dec 1Dec 4Dec 7Dec 12Dec 17Dec 25
20°FDec 1Dec 6Dec 12Dec 16Dec 21Dec 25Dec 30Jan 4Jan 12
16°FDec 14Dec 22Dec 26Dec 31Jan 4Jan 8Jan 12Jan 19Jan 28

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°F208202197193189185181176168
32°F233225220217212209204199192
28°F261254248243239235230225218
24°F286278273268264259253248239
20°F311303298294288283278272264
16°F337330323317311307303298290

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
97% 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
5,041
Cooling degree days, base 65°F
861
Growing degree days, base 40°F
5,638
Growing degree days, base 45°F
4,341
Growing degree days, base 50°F
3,227
Growing degree days, base 55°F
2,277
Growing degree days, base 60°F
1,491

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,00302
February86101
March761010
April447384
May19821290
June35139553
July1294758
August1280744
September42114522
October28411212
November567043
December84208

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 5.5 km from North Lynbrook. 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 USC00306138 (Oceanside). Public domain.