Clyde climate

Clyde Frost Dates and Growing Season

NOAA 1991-2020 normals for Concordia Muni AP, 22 km from Clyde, elevation 1469 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Concordia Muni AP. 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 18 and the first fall freeze around October 19, a growing season of about 183 days.

Median at 36°F
last April 29, first October 10
Median at 32°F
last April 18, first October 19
Median at 28°F
last April 7, first October 29

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 6May 3May 1Apr 29Apr 26Apr 23Apr 20Apr 15
32°FMay 2Apr 28Apr 25Apr 21Apr 18Apr 15Apr 11Apr 7Apr 3
28°FApr 22Apr 18Apr 14Apr 10Apr 7Apr 4Apr 1Mar 29Mar 22
24°FApr 14Apr 8Apr 4Apr 2Mar 30Mar 27Mar 22Mar 18Mar 12
20°FApr 4Mar 31Mar 26Mar 22Mar 18Mar 15Mar 11Mar 7Mar 3
16°FMar 28Mar 21Mar 16Mar 12Mar 9Mar 6Mar 2Feb 28Feb 21

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 26Sep 30Oct 4Oct 7Oct 10Oct 13Oct 16Oct 19Oct 22
32°FOct 3Oct 11Oct 15Oct 17Oct 19Oct 22Oct 24Oct 27Nov 1
28°FOct 15Oct 20Oct 23Oct 26Oct 29Nov 1Nov 3Nov 7Nov 12
24°FOct 23Oct 29Nov 1Nov 3Nov 6Nov 10Nov 13Nov 17Nov 23
20°FOct 31Nov 5Nov 8Nov 12Nov 16Nov 19Nov 23Nov 27Dec 3
16°FNov 8Nov 14Nov 19Nov 23Nov 26Nov 30Dec 3Dec 7Dec 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°F183176171167163159155150143
32°F203195191187183179174169162
28°F224217212207203198194188181
24°F245236231227222218213208201
20°F266257252246241237233227218
16°F286278272266262257252245237

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
5,314
Cooling degree days, base 65°F
1,373
Growing degree days, base 40°F
6,320
Growing degree days, base 45°F
5,062
Growing degree days, base 50°F
3,939
Growing degree days, base 55°F
2,953
Growing degree days, base 60°F
2,096

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,12201
February902010
March667263
April37112168
May13487424
June10292732
July1430894
August3356818
September64167555
October31826231
November686142
December1,03802

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 22 km from Clyde. 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 USW00013984 (Concordia Muni AP). Public domain.