Saukville climate

Saukville Frost Dates and Growing Season

NOAA 1991-2020 normals for Saukville Wwtp, 0.8 km from Saukville, elevation 766 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Saukville Wwtp. 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 5 and the first fall freeze around October 11, a growing season of about 158 days.

Median at 36°F
last May 19, first October 3
Median at 32°F
last May 5, first October 11
Median at 28°F
last April 23, first October 24

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 29May 25May 22May 19May 16May 12May 9May 4
32°FMay 19May 14May 10May 7May 5May 2Apr 30Apr 27Apr 22
28°FMay 5May 1Apr 29Apr 25Apr 23Apr 20Apr 17Apr 14Apr 9
24°FApr 25Apr 20Apr 17Apr 14Apr 11Apr 9Apr 5Apr 2Mar 29
20°FApr 15Apr 10Apr 5Apr 3Apr 1Mar 30Mar 26Mar 22Mar 16
16°FApr 4Apr 1Mar 29Mar 26Mar 22Mar 19Mar 15Mar 12Mar 6

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 21Sep 25Sep 29Oct 1Oct 3Oct 5Oct 7Oct 10Oct 14
32°FSep 29Oct 3Oct 6Oct 9Oct 11Oct 14Oct 17Oct 20Oct 24
28°FOct 8Oct 14Oct 18Oct 21Oct 24Oct 26Oct 28Oct 31Nov 4
24°FOct 23Oct 27Oct 31Nov 1Nov 4Nov 6Nov 10Nov 14Nov 18
20°FNov 1Nov 5Nov 8Nov 11Nov 14Nov 17Nov 20Nov 24Nov 28
16°FNov 9Nov 14Nov 18Nov 21Nov 23Nov 26Nov 29Dec 2Dec 8

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°F153147143139136132128124118
32°F174169165162158155151146139
28°F200194190186182179176171164
24°F224218214209206202198193186
20°F248241236231227222218214207
16°F270262256251246242238233225

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
7,628
Cooling degree days, base 65°F
355
Growing degree days, base 40°F
4,010
Growing degree days, base 45°F
3,006
Growing degree days, base 50°F
2,139
Growing degree days, base 55°F
1,396
Growing degree days, base 60°F
790

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,41500
February1,19700
March1,03407
April681026
May3608170
June10260410
July30144579
August39104530
September17337320
October515286
November864010
December1,21800

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 0.8 km from Saukville. 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 USC00477581 (Saukville Wwtp). Public domain.