Arrington climate

Arrington Frost Dates and Growing Season

NOAA 1991-2020 normals for Tye Rvr 1 Se, 6 km from Arrington, elevation 720 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Tye Rvr 1 Se. 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 15 and the first fall freeze around October 25, a growing season of about 193 days.

Median at 36°F
last April 29, first October 15
Median at 32°F
last April 15, first October 25
Median at 28°F
last April 1, first November 4

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

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 2Oct 7Oct 10Oct 13Oct 15Oct 18Oct 22Oct 24Oct 28
32°FOct 11Oct 16Oct 19Oct 23Oct 25Oct 28Oct 30Nov 2Nov 7
28°FOct 21Oct 27Oct 30Nov 1Nov 4Nov 7Nov 9Nov 12Nov 19
24°FNov 1Nov 5Nov 9Nov 11Nov 15Nov 19Nov 23Nov 29Dec 4
20°FNov 11Nov 16Nov 22Nov 26Dec 1Dec 4Dec 8Dec 15Dec 25
16°FNov 26Dec 2Dec 7Dec 13Dec 20Dec 25Dec 30Jan 5Jan 14

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°F190184179175170166162157150
32°F213207202197193189184178170
28°F238231226222218214211205198
24°F268259252246242237232227220
20°F300288280274268263257252243
16°F331321313306299294288278269

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
4,131
Cooling degree days, base 65°F
1,175
Growing degree days, base 40°F
6,623
Growing degree days, base 45°F
5,205
Growing degree days, base 50°F
3,955
Growing degree days, base 55°F
2,867
Growing degree days, base 60°F
1,942

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January876012
February706016
March571376
April27924229
May10485448
June14232667
July0355820
August1308772
September39142554
October24423263
November518279
December780019

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 6 km from Arrington. 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 USC00448600 (Tye Rvr 1 Se). Public domain.