Cabool climate

Cabool Frost Dates and Growing Season

NOAA 1991-2020 normals for Mtn Grove 2 N, 14.7 km from Cabool, elevation 1466 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Mtn Grove 2 N. 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 11 and the first fall freeze around October 28, a growing season of about 196 days.

Median at 36°F
last April 25, first October 18
Median at 32°F
last April 11, first October 28
Median at 28°F
last March 31, first November 5

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 1Apr 28Apr 25Apr 21Apr 17Apr 13Apr 6
32°FApr 29Apr 24Apr 18Apr 14Apr 11Apr 7Apr 4Mar 31Mar 25
28°FApr 15Apr 9Apr 5Apr 2Mar 31Mar 27Mar 23Mar 18Mar 12
24°FApr 6Mar 31Mar 27Mar 23Mar 19Mar 15Mar 11Mar 7Mar 1
20°FMar 29Mar 21Mar 16Mar 12Mar 8Mar 5Mar 1Feb 25Feb 18
16°FMar 18Mar 12Mar 7Mar 4Mar 1Feb 24Feb 20Feb 14Feb 4

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 3Oct 8Oct 12Oct 16Oct 18Oct 20Oct 23Oct 25Oct 29
32°FOct 15Oct 19Oct 22Oct 25Oct 28Oct 30Nov 1Nov 4Nov 9
28°FOct 23Oct 28Nov 1Nov 3Nov 5Nov 8Nov 12Nov 16Nov 23
24°FNov 1Nov 5Nov 8Nov 12Nov 15Nov 19Nov 25Nov 30Dec 5
20°FNov 8Nov 14Nov 19Nov 23Nov 27Dec 1Dec 4Dec 8Dec 15
16°FNov 16Nov 25Nov 30Dec 3Dec 7Dec 11Dec 17Dec 21Dec 27

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°F193187182177173169165160152
32°F218210205200196192187181173
28°F243235230224218214209204196
24°F267258252247241237231224216
20°F288279273267263257252245237
16°F311300294288283279272265256

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
4,738
Cooling degree days, base 65°F
1,216
Growing degree days, base 40°F
6,438
Growing degree days, base 45°F
5,105
Growing degree days, base 50°F
3,919
Growing degree days, base 55°F
2,872
Growing degree days, base 60°F
1,970

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,02607
February805015
March622272
April31417210
May11579433
June11233672
July1367831
August4338800
September55151547
October27527257
November597265
December913012

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 14.7 km from Cabool. 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 USC00235834 (Mtn Grove 2 N). Public domain.