Caseville climate

Caseville Frost Dates and Growing Season

NOAA 1991-2020 normals for Filion 5NNW, 15.3 km from Caseville, elevation 635 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Filion 5NNW. 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 8 and the first fall freeze around October 17, a growing season of about 162 days.

Median at 36°F
last May 20, first October 1
Median at 32°F
last May 8, first October 17
Median at 28°F
last April 27, first November 1

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 2May 30May 26May 23May 20May 17May 13May 9May 4
32°FMay 22May 18May 14May 11May 8May 4May 1Apr 29Apr 24
28°FMay 11May 5May 2Apr 30Apr 27Apr 24Apr 20Apr 16Apr 10
24°FApr 28Apr 23Apr 20Apr 16Apr 13Apr 10Apr 6Apr 3Mar 29
20°FApr 17Apr 12Apr 8Apr 5Apr 3Mar 31Mar 26Mar 21Mar 16
16°FApr 6Apr 1Mar 30Mar 25Mar 22Mar 19Mar 16Mar 12Mar 8

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 14Sep 20Sep 25Sep 29Oct 1Oct 4Oct 7Oct 12Oct 17
32°FSep 28Oct 4Oct 9Oct 14Oct 17Oct 20Oct 24Oct 27Nov 1
28°FOct 15Oct 22Oct 26Oct 30Nov 1Nov 3Nov 5Nov 10Nov 15
24°FNov 1Nov 4Nov 7Nov 10Nov 13Nov 16Nov 19Nov 22Nov 28
20°FNov 9Nov 14Nov 18Nov 21Nov 24Nov 27Dec 1Dec 5Dec 11
16°FNov 18Nov 24Nov 28Nov 30Dec 3Dec 7Dec 12Dec 16Dec 21

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°F158148143138134131126121114
32°F182176171166162157152147139
28°F206200195190187182178172163
24°F234228222217213209205201194
20°F260251246241236232227223216
16°F278271266262258253247241234

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
7,535
Cooling degree days, base 65°F
376
Growing degree days, base 40°F
4,023
Growing degree days, base 45°F
3,017
Growing degree days, base 50°F
2,146
Growing degree days, base 55°F
1,404
Growing degree days, base 60°F
800

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,35500
February1,21800
March1,07009
April691133
May36022186
June10777422
July38133559
August50101516
September18638312
October492597
November813013
December1,15600

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 15.3 km from Caseville. 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 USC00202804 (Filion 5NNW). Public domain.