Lyndonville climate

Lyndonville Frost Dates and Growing Season

NOAA 1991-2020 normals for Sutton, 9.4 km from Lyndonville, elevation 1500 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Sutton. 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 1, a growing season of about 143 days.

Median at 36°F
last May 24, first September 21
Median at 32°F
last May 9, first October 1
Median at 28°F
last April 28, first October 13

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 7Jun 2May 31May 27May 24May 22May 18May 15May 10
32°FMay 25May 20May 16May 13May 9May 6May 3Apr 30Apr 27
28°FMay 11May 6May 3Apr 30Apr 28Apr 26Apr 23Apr 21Apr 17
24°FApr 27Apr 24Apr 22Apr 19Apr 17Apr 15Apr 12Apr 9Apr 6
20°FApr 21Apr 16Apr 13Apr 11Apr 8Apr 6Apr 5Apr 3Mar 31
16°FApr 13Apr 9Apr 7Apr 5Apr 3Apr 2Mar 31Mar 29Mar 23

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 9Sep 13Sep 16Sep 18Sep 21Sep 24Sep 27Sep 29Oct 3
32°FSep 20Sep 24Sep 27Sep 30Oct 1Oct 4Oct 6Oct 10Oct 14
28°FOct 1Oct 4Oct 7Oct 10Oct 13Oct 16Oct 19Oct 22Oct 28
24°FOct 8Oct 14Oct 18Oct 21Oct 25Oct 28Nov 1Nov 3Nov 8
20°FOct 21Oct 27Oct 31Nov 2Nov 5Nov 8Nov 11Nov 14Nov 19
16°FNov 1Nov 5Nov 9Nov 12Nov 15Nov 17Nov 20Nov 23Nov 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°F139132127123119116111108100
32°F162155151147143139135130124
28°F185178174169166163159154148
24°F207202197193189186182177171
20°F226220216212209206201197190
16°F242236231228225221218213209

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
8,857
Cooling degree days, base 65°F
189
Growing degree days, base 40°F
3,430
Growing degree days, base 45°F
2,516
Growing degree days, base 50°F
1,719
Growing degree days, base 55°F
1,044
Growing degree days, base 60°F
526

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,59900
February1,35600
March1,21704
April777021
May3957147
June14935341
July4977493
August7949436
September26521230
October630145
November97704
December1,36400

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 9.4 km from Lyndonville. 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 USC00438169 (Sutton). Public domain.