Avilla climate

Avilla Frost Dates and Growing Season

NOAA 1991-2020 normals for Garrett, 9.6 km from Avilla, elevation 880 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Garrett. 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 29 and the first fall freeze around October 17, a growing season of about 171 days.

Median at 36°F
last May 7, first October 6
Median at 32°F
last April 29, first October 17
Median at 28°F
last April 18, first October 29

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

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 24Sep 28Oct 1Oct 4Oct 6Oct 9Oct 11Oct 15Oct 19
32°FOct 4Oct 9Oct 12Oct 15Oct 17Oct 20Oct 22Oct 26Oct 30
28°FOct 16Oct 21Oct 24Oct 27Oct 29Oct 31Nov 3Nov 6Nov 12
24°FOct 28Nov 1Nov 3Nov 6Nov 9Nov 12Nov 15Nov 20Nov 26
20°FNov 5Nov 9Nov 13Nov 17Nov 20Nov 25Nov 28Dec 3Dec 9
16°FNov 13Nov 19Nov 25Nov 29Dec 2Dec 6Dec 11Dec 16Dec 23

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°F169163159155151147144139132
32°F189183178174171167163158151
28°F213207202198194191187182175
24°F240232227222218214210205199
20°F264256250245240236230224217
16°F288279272266262257252244235

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
6,344
Cooling degree days, base 65°F
744
Growing degree days, base 40°F
5,081
Growing degree days, base 45°F
3,952
Growing degree days, base 50°F
2,958
Growing degree days, base 55°F
2,089
Growing degree days, base 60°F
1,348

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,26301
February1,06502
March888121
April509588
May20943318
June28158580
July6255714
August15193643
September11079420
October41010147
November756021
December1,08702

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 9.6 km from Avilla. 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 USC00123206 (Garrett). Public domain.