Vaiden climate

Vaiden Frost Dates and Growing Season

NOAA 1991-2020 normals for Winona 5 E, 20.1 km from Vaiden, elevation 392 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Winona 5 E. 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 April 7 and the first fall freeze around October 29, a growing season of about 203 days.

Median at 36°F
last April 19, first October 21
Median at 32°F
last April 7, first October 29
Median at 28°F
last March 26, first November 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°FMay 3Apr 30Apr 26Apr 22Apr 19Apr 16Apr 12Apr 9Apr 4
32°FApr 24Apr 17Apr 14Apr 10Apr 7Apr 4Mar 31Mar 28Mar 22
28°FApr 11Apr 5Apr 1Mar 30Mar 26Mar 21Mar 18Mar 13Mar 5
24°FMar 30Mar 22Mar 18Mar 14Mar 10Mar 6Mar 1Feb 25Feb 18
20°FMar 14Mar 8Mar 3Feb 28Feb 23Feb 18Feb 12Feb 5Jan 28
16°FMar 6Feb 28Feb 19Feb 12Feb 5Jan 31Jan 26Jan 17Jan 5

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°FOct 8Oct 11Oct 15Oct 17Oct 21Oct 23Oct 25Oct 28Nov 1
32°FOct 16Oct 20Oct 23Oct 26Oct 29Oct 31Nov 2Nov 5Nov 11
28°FOct 25Oct 30Nov 1Nov 4Nov 7Nov 11Nov 15Nov 20Nov 27
24°FNov 3Nov 8Nov 12Nov 17Nov 22Nov 26Dec 1Dec 4Dec 10
20°FNov 11Nov 22Nov 29Dec 2Dec 6Dec 12Dec 19Dec 30Jan 6
16°FNov 29Dec 7Dec 15Dec 24Dec 31Jan 3Jan 8Jan 15Jan 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°F203196191187183179175171164
32°F225218212207203199195190184
28°F254244238232227222216211204
24°F285275266261256251246238230
20°F324311302295287280273265254
16°F360344335329322314306299285

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
91% 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
3,305
Cooling degree days, base 65°F
1,603
Growing degree days, base 40°F
7,703
Growing degree days, base 45°F
6,175
Growing degree days, base 50°F
4,798
Growing degree days, base 55°F
3,572
Growing degree days, base 60°F
2,504

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January748139
February577154
March4127154
April20334300
May51137551
June2311759
July0411876
August0397862
September17239672
October17658363
November4536116
December667354

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 20.1 km from Vaiden. 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 USC00229743 (Winona 5 E). Public domain.