Haven climate

Haven Frost Dates and Growing Season

NOAA 1991-2020 normals for Hutchinson 10 Sw, 21.9 km from Haven, elevation 1549 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Hutchinson 10 Sw. 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 20 and the first fall freeze around October 19, a growing season of about 181 days.

Median at 36°F
last April 30, first October 10
Median at 32°F
last April 20, first October 19
Median at 28°F
last April 10, first October 28

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 11May 7May 4May 1Apr 30Apr 27Apr 24Apr 21Apr 16
32°FMay 2Apr 29Apr 26Apr 23Apr 20Apr 17Apr 14Apr 11Apr 5
28°FApr 25Apr 21Apr 17Apr 13Apr 10Apr 8Apr 5Apr 1Mar 25
24°FApr 16Apr 10Apr 6Apr 3Mar 31Mar 28Mar 23Mar 17Mar 11
20°FApr 5Apr 1Mar 27Mar 22Mar 18Mar 14Mar 10Mar 6Mar 1
16°FMar 29Mar 20Mar 14Mar 10Mar 6Mar 3Feb 28Feb 24Feb 18

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 25Sep 30Oct 4Oct 7Oct 10Oct 13Oct 15Oct 18Oct 22
32°FOct 3Oct 10Oct 14Oct 17Oct 19Oct 21Oct 24Oct 26Oct 31
28°FOct 16Oct 20Oct 23Oct 25Oct 28Oct 31Nov 2Nov 5Nov 9
24°FOct 24Oct 28Nov 1Nov 3Nov 5Nov 7Nov 11Nov 14Nov 19
20°FOct 30Nov 3Nov 7Nov 11Nov 14Nov 18Nov 21Nov 25Dec 1
16°FNov 6Nov 12Nov 16Nov 20Nov 23Nov 27Nov 30Dec 5Dec 12

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°F180174170166163159156151144
32°F200193189185181177172168162
28°F223214208204200196192186180
24°F243235229225220215210205198
20°F264257250246241236230223215
16°F287276270265260255251245236

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
5,050
Cooling degree days, base 65°F
1,489
Growing degree days, base 40°F
6,530
Growing degree days, base 45°F
5,245
Growing degree days, base 50°F
4,105
Growing degree days, base 55°F
3,103
Growing degree days, base 60°F
2,233

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,06501
February86008
March645261
April35712177
May12298445
June9310751
July1456921
August2397860
September54185583
October29228250
November653146
December99003

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 21.9 km from Haven. 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 USC00143930 (Hutchinson 10 Sw). Public domain.