Wayzata climate

Wayzata Frost Dates and Growing Season

NOAA 1991-2020 normals for New Hope, 10.8 km from Wayzata, elevation 910 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for New Hope. 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 29 and the first fall freeze around October 12, a growing season of about 163 days.

Median at 36°F
last May 8, first October 1
Median at 32°F
last April 29, first October 12
Median at 28°F
last April 19, first October 22

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 23May 18May 14May 11May 8May 6May 3Apr 30Apr 26
32°FMay 12May 7May 4May 1Apr 29Apr 26Apr 23Apr 19Apr 15
28°FMay 1Apr 27Apr 24Apr 21Apr 19Apr 16Apr 13Apr 10Apr 5
24°FApr 22Apr 18Apr 14Apr 12Apr 9Apr 7Apr 4Apr 2Mar 28
20°FApr 16Apr 11Apr 7Apr 4Apr 2Mar 31Mar 28Mar 23Mar 17
16°FApr 9Apr 4Apr 1Mar 30Mar 26Mar 22Mar 18Mar 14Mar 9

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 19Sep 24Sep 27Sep 30Oct 1Oct 4Oct 6Oct 9Oct 14
32°FSep 29Oct 2Oct 5Oct 9Oct 12Oct 15Oct 18Oct 21Oct 25
28°FOct 8Oct 14Oct 17Oct 20Oct 22Oct 25Oct 27Oct 31Nov 4
24°FOct 19Oct 24Oct 27Oct 30Nov 1Nov 3Nov 6Nov 9Nov 14
20°FOct 28Nov 1Nov 4Nov 7Nov 9Nov 12Nov 15Nov 18Nov 22
16°FNov 4Nov 8Nov 11Nov 14Nov 16Nov 19Nov 22Nov 25Nov 30

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°F163156153149145142137132126
32°F182176171167163159155151144
28°F205197193189185182178174166
24°F223216212208205201197192186
20°F241233229225220216213208202
16°F255249244240235231227221215

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
7,683
Cooling degree days, base 65°F
671
Growing degree days, base 40°F
4,656
Growing degree days, base 45°F
3,629
Growing degree days, base 50°F
2,711
Growing degree days, base 55°F
1,906
Growing degree days, base 60°F
1,223

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,54100
February1,26600
March1,012010
April575369
May24135281
June44139545
July6245704
August16179628
September15265372
October526595
November94209
December1,36200

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 10.8 km from Wayzata. 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 USC00215838 (New Hope). Public domain.