Evart climate

Evart Frost Dates and Growing Season

NOAA 1991-2020 normals for Big Rapids Wtp, 28.1 km from Evart, elevation 898 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Big Rapids Wtp. 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 13 and the first fall freeze around October 2, a growing season of about 142 days.

Median at 36°F
last May 25, first September 22
Median at 32°F
last May 13, first October 2
Median at 28°F
last April 30, first October 13

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 10Jun 3May 31May 28May 25May 22May 19May 16May 9
32°FMay 28May 23May 20May 17May 13May 9May 5May 2Apr 28
28°FMay 17May 12May 6May 3Apr 30Apr 29Apr 26Apr 22Apr 18
24°FMay 4Apr 30Apr 26Apr 22Apr 19Apr 17Apr 13Apr 10Apr 6
20°FApr 22Apr 17Apr 13Apr 10Apr 8Apr 5Apr 3Mar 31Mar 24
16°FApr 12Apr 7Apr 4Apr 2Mar 31Mar 28Mar 24Mar 20Mar 16

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 6Sep 11Sep 16Sep 19Sep 22Sep 25Sep 29Oct 1Oct 4
32°FSep 18Sep 23Sep 28Oct 1Oct 2Oct 4Oct 7Oct 10Oct 16
28°FSep 30Oct 3Oct 6Oct 10Oct 13Oct 16Oct 21Oct 25Oct 30
24°FOct 10Oct 17Oct 22Oct 25Oct 29Nov 1Nov 3Nov 7Nov 12
20°FOct 27Nov 1Nov 3Nov 6Nov 9Nov 12Nov 15Nov 19Nov 25
16°FNov 4Nov 9Nov 13Nov 17Nov 21Nov 25Nov 28Dec 1Dec 6

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°F13913112612211811411010596
32°F162155151146142137133128122
28°F186179174169165161156152144
24°F212205200196191186182176169
20°F236230224219215211206200194
16°F258249243238234230225220213

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
7,621
Cooling degree days, base 65°F
404
Growing degree days, base 40°F
4,056
Growing degree days, base 45°F
3,064
Growing degree days, base 50°F
2,201
Growing degree days, base 55°F
1,462
Growing degree days, base 60°F
854

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,38100
February1,21000
March1,05708
April666139
May31921210
June8386454
July25155595
August45107527
September20331291
October554271
November87606
December1,20100

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 28.1 km from Evart. 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 USC00200779 (Big Rapids Wtp). Public domain.