Gogebic County climate

Gogebic County Frost Dates and Growing Season

NOAA 1991-2020 normals for Bergland Dam, 21.5 km from Gogebic County, elevation 1300 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Bergland Dam. 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 26 and the first fall freeze around September 27, a growing season of about 123 days.

Median at 36°F
last June 4, first September 14
Median at 32°F
last May 26, first September 27
Median at 28°F
last May 12, 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 18Jun 13Jun 9Jun 6Jun 4Jun 2May 31May 27May 23
32°FJun 8Jun 3May 31May 28May 26May 22May 19May 15May 9
28°FMay 28May 23May 19May 15May 12May 9May 6May 2Apr 28
24°FMay 17May 11May 7May 4May 1Apr 29Apr 26Apr 22Apr 16
20°FMay 6May 1Apr 28Apr 25Apr 22Apr 19Apr 15Apr 11Apr 6
16°FApr 27Apr 22Apr 19Apr 16Apr 13Apr 10Apr 7Apr 4Apr 1

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 28Sep 2Sep 6Sep 10Sep 14Sep 18Sep 21Sep 24Sep 30
32°FSep 10Sep 16Sep 21Sep 24Sep 27Oct 1Oct 2Oct 5Oct 9
28°FSep 22Sep 27Oct 1Oct 4Oct 7Oct 10Oct 13Oct 17Oct 23
24°FOct 3Oct 10Oct 15Oct 18Oct 21Oct 25Oct 30Nov 2Nov 6
20°FOct 20Oct 25Oct 29Nov 1Nov 3Nov 6Nov 10Nov 13Nov 17
16°FNov 1Nov 4Nov 7Nov 10Nov 13Nov 15Nov 18Nov 22Nov 26

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°F1211141081049994908475
32°F142136131127123119115110103
28°F167160155150146142138132125
24°F192185179175171166162157148
20°F215208202198194190186180174
16°F231225221218213210205201193

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
9,422
Cooling degree days, base 65°F
209
Growing degree days, base 40°F
3,272
Growing degree days, base 45°F
2,401
Growing degree days, base 50°F
1,649
Growing degree days, base 55°F
1,020
Growing degree days, base 60°F
530

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,64400
February1,43800
March1,29300
April837013
May44310137
June16142340
July7582473
August10055421
September28519221
October667142
November1,03403
December1,44800

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 21.5 km from Gogebic County. 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 USC00200718 (Bergland Dam). Public domain.