Lyles climate

Lyles Frost Dates and Growing Season

NOAA 1991-2020 normals for Dickson, 17.8 km from Lyles, elevation 780 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Dickson. 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 13 and the first fall freeze around October 25, a growing season of about 195 days.

Median at 36°F
last April 25, first October 17
Median at 32°F
last April 13, first October 25
Median at 28°F
last March 31, first November 3

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

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 4Oct 8Oct 11Oct 14Oct 17Oct 19Oct 22Oct 24Oct 28
32°FOct 12Oct 18Oct 20Oct 22Oct 25Oct 27Oct 30Nov 2Nov 6
28°FOct 22Oct 26Oct 30Nov 1Nov 3Nov 6Nov 9Nov 13Nov 18
24°FNov 1Nov 5Nov 9Nov 12Nov 15Nov 17Nov 21Nov 27Dec 3
20°FNov 11Nov 15Nov 19Nov 23Nov 28Dec 1Dec 4Dec 11Dec 20
16°FNov 19Nov 28Dec 3Dec 7Dec 12Dec 18Dec 24Dec 29Jan 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°F194186182178174170166161155
32°F216209205200195191187182176
28°F240233227222217214210204197
24°F268259252247242237232226218
20°F296284278273267262256250241
16°F327316307302295289282275264

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
3,826
Cooling degree days, base 65°F
1,327
Growing degree days, base 40°F
7,082
Growing degree days, base 45°F
5,626
Growing degree days, base 50°F
4,316
Growing degree days, base 55°F
3,161
Growing degree days, base 60°F
2,165

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January853022
February663134
March4896116
April22329282
May70106501
June4259705
July0368832
August1346811
September31178597
October22133298
November512286
December760032

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 17.8 km from Lyles. 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 USC00402489 (Dickson). Public domain.