Leland climate

Leland Frost Dates and Growing Season

NOAA 1991-2020 normals for Northport 2W, 15 km from Leland, elevation 746 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Northport 2W. 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 May 9 and the first fall freeze around October 26, a growing season of about 169 days.

Median at 36°F
last May 23, first October 10
Median at 32°F
last May 9, first October 26
Median at 28°F
last April 27, first November 8

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°FJun 5May 31May 29May 26May 23May 20May 17May 13May 8
32°FMay 24May 19May 16May 12May 9May 6May 2Apr 29Apr 24
28°FMay 12May 7May 2Apr 30Apr 27Apr 24Apr 21Apr 17Apr 12
24°FApr 28Apr 24Apr 20Apr 16Apr 13Apr 10Apr 7Apr 4Mar 31
20°FApr 16Apr 11Apr 7Apr 5Apr 2Apr 1Mar 29Mar 25Mar 20
16°FApr 7Apr 3Apr 1Mar 30Mar 26Mar 23Mar 20Mar 17Mar 11

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

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°F163155149144140136132126120
32°F188182177173169165160156147
28°F215208203198194190185180174
24°F242235230225221217212206199
20°F263255250245241237233228221
16°F285277271266261256251246239

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
7,442
Cooling degree days, base 65°F
302
Growing degree days, base 40°F
3,866
Growing degree days, base 45°F
2,871
Growing degree days, base 50°F
2,017
Growing degree days, base 55°F
1,292
Growing degree days, base 60°F
711

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,29000
February1,16200
March1,07218
April718129
May4069143
June14345357
July42108532
August3797525
September17138324
October492388
November791012
December1,12100

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 15 km from Leland. 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 USC00206007 (Northport 2W). Public domain.