Antigo climate

Antigo Frost Dates and Growing Season

NOAA 1991-2020 normals for Antigo, 3.8 km from Antigo, elevation 1519 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Antigo. 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 14 and the first fall freeze around September 30, a growing season of about 139 days.

Median at 36°F
last May 27, first September 20
Median at 32°F
last May 14, first September 30
Median at 28°F
last May 1, first October 11

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 9Jun 4Jun 1May 29May 27May 24May 21May 17May 12
32°FMay 28May 23May 20May 17May 14May 10May 7May 4Apr 30
28°FMay 17May 11May 7May 5May 1Apr 29Apr 27Apr 23Apr 18
24°FMay 3Apr 29Apr 26Apr 23Apr 20Apr 17Apr 14Apr 9Apr 6
20°FApr 24Apr 19Apr 15Apr 12Apr 9Apr 7Apr 4Apr 2Mar 28
16°FApr 15Apr 11Apr 7Apr 5Apr 3Apr 1Mar 29Mar 26Mar 20

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 3Sep 9Sep 14Sep 18Sep 20Sep 23Sep 26Oct 1Oct 4
32°FSep 14Sep 20Sep 24Sep 27Sep 30Oct 2Oct 5Oct 9Oct 13
28°FSep 24Sep 30Oct 3Oct 7Oct 11Oct 13Oct 17Oct 21Oct 26
24°FOct 7Oct 13Oct 17Oct 21Oct 25Oct 29Nov 1Nov 4Nov 9
20°FOct 22Oct 29Nov 1Nov 3Nov 5Nov 8Nov 12Nov 15Nov 19
16°FNov 2Nov 6Nov 9Nov 13Nov 15Nov 18Nov 20Nov 24Nov 28

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°F13612912412011611210710295
32°F158152147143139135130126119
28°F182175170165161157152147140
24°F209201196190186182177172162
20°F228222218214210206201196189
16°F243236233229225222219215208

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
8,864
Cooling degree days, base 65°F
303
Growing degree days, base 40°F
3,673
Growing degree days, base 45°F
2,741
Growing degree days, base 50°F
1,930
Growing degree days, base 55°F
1,244
Growing degree days, base 60°F
691

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,63400
February1,39900
March1,18102
April725027
May37612166
June11663401
July44116536
August7281474
September23928264
October626356
November1,01003
December1,44500

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 3.8 km from Antigo. 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 USC00470239 (Antigo). Public domain.