Argyle climate

Argyle Frost Dates and Growing Season

NOAA 1991-2020 normals for Darlington Wwtp, 19.7 km from Argyle, elevation 854 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Darlington Wwtp. 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 3 and the first fall freeze around October 4, a growing season of about 153 days.

Median at 36°F
last May 14, first September 25
Median at 32°F
last May 3, first October 4
Median at 28°F
last April 23, first October 16

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 28May 24May 20May 17May 14May 11May 7May 3Apr 30
32°FMay 19May 13May 10May 6May 3Apr 30Apr 28Apr 23Apr 19
28°FMay 9May 3Apr 30Apr 26Apr 23Apr 20Apr 17Apr 14Apr 9
24°FApr 29Apr 22Apr 18Apr 15Apr 12Apr 8Apr 5Apr 2Mar 29
20°FApr 14Apr 9Apr 5Apr 3Apr 1Mar 29Mar 25Mar 21Mar 14
16°FApr 4Mar 31Mar 27Mar 24Mar 20Mar 17Mar 15Mar 12Mar 7

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 22Sep 25Sep 27Sep 30Oct 3Oct 7
32°FSep 20Sep 25Sep 28Oct 1Oct 4Oct 7Oct 10Oct 14Oct 19
28°FSep 29Oct 5Oct 9Oct 13Oct 16Oct 18Oct 21Oct 24Oct 29
24°FOct 12Oct 19Oct 22Oct 25Oct 27Oct 29Nov 1Nov 4Nov 9
20°FOct 26Oct 30Nov 1Nov 3Nov 6Nov 9Nov 13Nov 17Nov 23
16°FNov 2Nov 6Nov 11Nov 14Nov 17Nov 20Nov 24Nov 27Dec 1

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°F153146141138134130126121115
32°F172167162157153150145141135
28°F195188184180175170165159153
24°F217210206202198194190185177
20°F240233228224220216213208201
16°F261254249245240235231226219

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
7,384
Cooling degree days, base 65°F
570
Growing degree days, base 40°F
4,546
Growing degree days, base 45°F
3,496
Growing degree days, base 50°F
2,578
Growing degree days, base 55°F
1,782
Growing degree days, base 60°F
1,105

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,46100
February1,21400
March974116
April567362
May26035270
June46129534
July13197649
August23147589
September17053343
October4995103
November881011
December1,27701

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 19.7 km from Argyle. 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 USC00472001 (Darlington Wwtp). Public domain.