Osceola County climate

Osceola County Frost Dates and Growing Season

NOAA 1991-2020 normals for Cadillac 9&10 News, 25.5 km from Osceola County, elevation 1363 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Cadillac 9&10 News. 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 May 15 and the first fall freeze around October 1, a growing season of about 139 days.

Median at 36°F
last May 29, first September 20
Median at 32°F
last May 15, first October 1
Median at 28°F
last May 3, first October 13

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°FJun 15Jun 8Jun 4Jun 1May 29May 26May 23May 19May 12
32°FMay 30May 25May 22May 18May 15May 11May 7May 4Apr 30
28°FMay 19May 13May 9May 5May 3Apr 30Apr 29Apr 25Apr 22
24°FMay 6May 1Apr 29Apr 26Apr 24Apr 22Apr 19Apr 16Apr 11
20°FApr 26Apr 22Apr 19Apr 17Apr 14Apr 11Apr 8Apr 4Apr 1
16°FApr 17Apr 13Apr 9Apr 6Apr 4Apr 2Mar 31Mar 28Mar 22

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

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°F1351281231181131091059992
32°F159152148143139134129124116
28°F183176171166162158154150142
24°F206198193189185181177172165
20°F229223217213209205201196189
16°F254247241235231227222217211

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
7,826
Cooling degree days, base 65°F
351
Growing degree days, base 40°F
3,948
Growing degree days, base 45°F
2,974
Growing degree days, base 50°F
2,124
Growing degree days, base 55°F
1,388
Growing degree days, base 60°F
789

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,41900
February1,23900
March1,109112
April696034
May33516203
June8470438
July37130558
August5398510
September20736291
October550170
November88408
December1,21400

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 25.5 km from Osceola County. 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 USC00201178 (Cadillac 9&10 News). Public domain.