Strum climate

Strum Frost Dates and Growing Season

NOAA 1991-2020 normals for Mondovi, 22.2 km from Strum, elevation 830 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Mondovi. 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 10 and the first fall freeze around October 2, a growing season of about 144 days.

Median at 36°F
last May 20, first September 23
Median at 32°F
last May 10, first October 2
Median at 28°F
last April 30, first October 9

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 26May 23May 20May 18May 15May 12May 7
32°FMay 25May 19May 16May 13May 10May 7May 5May 1Apr 27
28°FMay 14May 9May 5May 3Apr 30Apr 27Apr 24Apr 21Apr 15
24°FMay 4Apr 29Apr 25Apr 22Apr 18Apr 15Apr 12Apr 9Apr 4
20°FApr 23Apr 18Apr 14Apr 10Apr 8Apr 5Apr 3Mar 31Mar 26
16°FApr 13Apr 8Apr 5Apr 2Mar 31Mar 29Mar 26Mar 21Mar 15

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 9Sep 14Sep 17Sep 20Sep 23Sep 26Sep 29Oct 2Oct 5
32°FSep 19Sep 23Sep 27Sep 30Oct 2Oct 4Oct 6Oct 9Oct 13
28°FSep 27Oct 1Oct 4Oct 7Oct 9Oct 12Oct 15Oct 19Oct 24
24°FOct 7Oct 11Oct 15Oct 18Oct 21Oct 24Oct 27Oct 30Nov 5
20°FOct 17Oct 23Oct 27Oct 30Nov 1Nov 4Nov 7Nov 10Nov 15
16°FOct 30Nov 2Nov 5Nov 8Nov 11Nov 14Nov 17Nov 21Nov 27

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°F143137133129125121116111104
32°F163156151147144140136131125
28°F184176171167163159155150144
24°F205198194189185181177171164
20°F225219214210206202198192184
16°F245237232229224220216212206

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
7,317
Cooling degree days, base 65°F
699
Growing degree days, base 40°F
4,794
Growing degree days, base 45°F
3,736
Growing degree days, base 50°F
2,793
Growing degree days, base 55°F
1,968
Growing degree days, base 60°F
1,265

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,48500
February1,21500
March962116
April536582
May22044305
June40150560
July8240697
August20181626
September14871382
October4897113
November891011
December1,30400

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 22.2 km from Strum. 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 USC00475563 (Mondovi). Public domain.