Negaunee climate

Negaunee Frost Dates and Growing Season

NOAA 1991-2020 normals for Marquette, 6 km from Negaunee, elevation 1411 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Marquette. 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 29, a growing season of about 129 days.

Median at 36°F
last June 3, first September 14
Median at 32°F
last May 22, first September 29
Median at 28°F
last May 8, first October 10

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 19Jun 14Jun 9Jun 5Jun 3Jun 1May 30May 27May 22
32°FJun 4Jun 1May 29May 26May 22May 19May 15May 11May 6
28°FMay 23May 18May 14May 11May 8May 5May 2Apr 29Apr 26
24°FMay 11May 7May 4May 1Apr 29Apr 26Apr 23Apr 19Apr 14
20°FMay 2Apr 28Apr 25Apr 22Apr 19Apr 16Apr 14Apr 10Apr 6
16°FApr 24Apr 19Apr 16Apr 13Apr 10Apr 8Apr 5Apr 3Mar 31

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 11Sep 14Sep 18Sep 21Sep 25Oct 1
32°FSep 11Sep 18Sep 22Sep 25Sep 29Oct 1Oct 4Oct 7Oct 12
28°FSep 24Oct 1Oct 4Oct 7Oct 10Oct 13Oct 17Oct 21Oct 26
24°FOct 7Oct 13Oct 17Oct 20Oct 24Oct 27Oct 31Nov 3Nov 7
20°FOct 24Oct 29Nov 1Nov 2Nov 5Nov 7Nov 10Nov 14Nov 18
16°FNov 2Nov 5Nov 9Nov 12Nov 15Nov 18Nov 21Nov 24Dec 1

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°F12311611110810298938777
32°F149142137133129125121116108
28°F175168163159155151146140133
24°F199191187183178174169164155
20°F219212206203198194190185179
16°F236229224220216212208203197

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
9,218
Cooling degree days, base 65°F
237
Growing degree days, base 40°F
3,270
Growing degree days, base 45°F
2,407
Growing degree days, base 50°F
1,658
Growing degree days, base 55°F
1,031
Growing degree days, base 60°F
553

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,57000
February1,37600
March1,24003
April846017
May45712136
June17447332
July8290473
August10563424
September28524225
October669146
November1,02604
December1,38700

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 6 km from Negaunee. 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 USW00094850 (Marquette). Public domain.