Menominee County climate

Menominee County Frost Dates and Growing Season

NOAA 1991-2020 normals for Stephenson 5WSW, 21.2 km from Menominee County, elevation 690 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Stephenson 5WSW. 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 22 and the first fall freeze around September 27, a growing season of about 126 days.

Median at 36°F
last June 3, first September 13
Median at 32°F
last May 22, first September 27
Median at 28°F
last May 10, first October 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°FJun 25Jun 15Jun 9Jun 6Jun 3May 31May 29May 26May 21
32°FJun 4May 31May 28May 25May 22May 19May 16May 13May 7
28°FMay 25May 20May 17May 14May 10May 7May 3Apr 30Apr 26
24°FMay 15May 9May 4May 1Apr 28Apr 26Apr 23Apr 20Apr 14
20°FApr 30Apr 27Apr 23Apr 20Apr 16Apr 13Apr 9Apr 6Apr 2
16°FApr 22Apr 16Apr 12Apr 8Apr 5Apr 2Mar 31Mar 28Mar 21

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°FAug 27Sep 2Sep 6Sep 10Sep 13Sep 17Sep 20Sep 24Sep 29
32°FSep 10Sep 16Sep 20Sep 23Sep 27Sep 29Oct 1Oct 5Oct 10
28°FSep 23Sep 28Oct 1Oct 4Oct 7Oct 10Oct 13Oct 17Oct 23
24°FOct 5Oct 10Oct 14Oct 18Oct 22Oct 25Oct 28Nov 1Nov 5
20°FOct 18Oct 25Oct 29Nov 1Nov 3Nov 6Nov 9Nov 14Nov 19
16°FNov 1Nov 6Nov 9Nov 13Nov 16Nov 18Nov 21Nov 24Nov 29

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°F12111510910510096928572
32°F146139134130126122118113106
28°F171163158153149145140134127
24°F196188183178174169165159150
20°F219212207203198194189184175
16°F242235229225222217212207200

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
8,320
Cooling degree days, base 65°F
321
Growing degree days, base 40°F
3,738
Growing degree days, base 45°F
2,791
Growing degree days, base 50°F
1,972
Growing degree days, base 55°F
1,280
Growing degree days, base 60°F
719

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,51900
February1,31200
March1,10803
April719125
May37615166
June11167408
July42123546
August5688497
September22826265
October589258
November93504
December1,32500

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 21.2 km from Menominee 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 USC00207867 (Stephenson 5WSW). Public domain.