Rogersville climate

Rogersville Frost Dates and Growing Season

NOAA 1991-2020 normals for Oldfield, 16 km from Rogersville, elevation 1240 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Oldfield. 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 26 and the first fall freeze around October 13, a growing season of about 167 days.

Median at 36°F
last May 3, first October 3
Median at 32°F
last April 26, first October 13
Median at 28°F
last April 17, first October 23

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

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°F168163159155151148144139132
32°F184178174170167163159154149
28°F206198194190186182178173166
24°F228221215211206201197193187
20°F252245238233227223217211203
16°F274267260255250245239232221

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
5,302
Cooling degree days, base 65°F
798
Growing degree days, base 40°F
5,617
Growing degree days, base 45°F
4,361
Growing degree days, base 50°F
3,250
Growing degree days, base 55°F
2,279
Growing degree days, base 60°F
1,455

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,07404
February87503
March687141
April3748158
May14550374
June27151574
July3270731
August5233693
September8577445
October3538182
November679139
December99606

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 16 km from Rogersville. 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 USC00236302 (Oldfield). Public domain.