Levant climate

Levant Frost Dates and Growing Season

NOAA 1991-2020 normals for Bangor Intl AP, 12.1 km from Levant, elevation 148 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Bangor Intl AP. 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 4 and the first fall freeze around October 4, a growing season of about 152 days.

Median at 36°F
last May 17, first September 25
Median at 32°F
last May 4, first October 4
Median at 28°F
last April 23, first October 17

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 31May 26May 23May 19May 17May 15May 12May 9May 5
32°FMay 17May 13May 9May 7May 4May 2Apr 30Apr 27Apr 24
28°FMay 4May 1Apr 28Apr 26Apr 23Apr 21Apr 18Apr 15Apr 11
24°FApr 24Apr 20Apr 17Apr 15Apr 12Apr 9Apr 6Apr 4Mar 31
20°FApr 15Apr 11Apr 7Apr 4Apr 2Apr 1Mar 30Mar 26Mar 21
16°FApr 4Apr 1Mar 31Mar 28Mar 25Mar 22Mar 19Mar 16Mar 13

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 13Sep 17Sep 20Sep 23Sep 25Sep 28Oct 1Oct 3Oct 7
32°FSep 23Sep 27Sep 30Oct 2Oct 4Oct 7Oct 10Oct 14Oct 21
28°FOct 1Oct 6Oct 10Oct 13Oct 17Oct 20Oct 25Oct 29Nov 2
24°FOct 14Oct 20Oct 24Oct 27Oct 31Nov 2Nov 5Nov 9Nov 14
20°FOct 28Nov 2Nov 5Nov 9Nov 12Nov 15Nov 18Nov 22Nov 26
16°FNov 10Nov 14Nov 18Nov 21Nov 24Nov 26Nov 29Dec 1Dec 6

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°F148141137133129125121117111
32°F170164159156152148145140134
28°F196188184180175171167162156
24°F219212208204200196192187180
20°F241235231226223219214210203
16°F262255250246242238235230225

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
7,626
Cooling degree days, base 65°F
379
Growing degree days, base 40°F
4,046
Growing degree days, base 45°F
3,031
Growing degree days, base 50°F
2,155
Growing degree days, base 55°F
1,414
Growing degree days, base 60°F
817

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,44000
February1,23100
March1,06602
April666021
May3337169
June9858411
July16156604
August26125564
September18632305
October522169
November83109
December1,21201

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 12.1 km from Levant. 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 USW00014606 (Bangor Intl AP). Public domain.