Davison climate

Davison Frost Dates and Growing Season

NOAA 1991-2020 normals for Burton 4N, 7 km from Davison, elevation 757 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Burton 4N. 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 8 and the first fall freeze around October 5, a growing season of about 148 days.

Median at 36°F
last May 20, first September 25
Median at 32°F
last May 8, first October 5
Median at 28°F
last April 29, first October 19

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

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 12Sep 17Sep 20Sep 23Sep 25Sep 27Sep 30Oct 3Oct 7
32°FSep 22Sep 27Sep 30Oct 3Oct 5Oct 8Oct 11Oct 14Oct 19
28°FOct 4Oct 9Oct 14Oct 17Oct 19Oct 22Oct 25Oct 28Nov 1
24°FOct 19Oct 24Oct 27Oct 30Nov 1Nov 4Nov 6Nov 10Nov 15
20°FNov 1Nov 3Nov 7Nov 10Nov 13Nov 16Nov 20Nov 24Dec 1
16°FNov 9Nov 14Nov 17Nov 21Nov 25Nov 29Dec 2Dec 6Dec 14

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°F144138134130126123118113108
32°F166160156151148145141136130
28°F189183178174170167163157151
24°F212206202198194191188184177
20°F240232226221216213209204199
16°F265256250246241237231226219

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
6,983
Cooling degree days, base 65°F
521
Growing degree days, base 40°F
4,471
Growing degree days, base 45°F
3,406
Growing degree days, base 50°F
2,488
Growing degree days, base 55°F
1,698
Growing degree days, base 60°F
1,029

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,29900
February1,14500
March978115
April616148
May28526245
June62101490
July18193640
August27143581
September15951349
October4715105
November794015
December1,13001

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 7 km from Davison. 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 USC00201150 (Burton 4N). Public domain.