Lawrenceburg climate

Lawrenceburg Frost Dates and Growing Season

NOAA 1991-2020 normals for Lawrenceburg Filt Plt, 1.4 km from Lawrenceburg, elevation 870 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Lawrenceburg Filt Plt. 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 8 and the first fall freeze around October 31, a growing season of about 204 days.

Median at 36°F
last April 22, first October 21
Median at 32°F
last April 8, first October 31
Median at 28°F
last March 26, first November 7

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

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°F205198193188183179174169161
32°F228220214209204200195190182
28°F255246240234228224219213205
24°F286274267261256250245239229
20°F313303295290282276269261251
16°F343331324317310304297289277

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
98% 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
3,672
Cooling degree days, base 65°F
1,435
Growing degree days, base 40°F
7,287
Growing degree days, base 45°F
5,806
Growing degree days, base 50°F
4,476
Growing degree days, base 55°F
3,305
Growing degree days, base 60°F
2,291

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January828023
February639034
March4734118
April21730286
May63120523
June3284730
July0395860
August1363828
September26195620
October19741327
November490396
December735030

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 1.4 km from Lawrenceburg. 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 USC00405089 (Lawrenceburg Filt Plt). Public domain.