Marienville climate

Marienville Frost Dates and Growing Season

NOAA 1991-2020 normals for Cooksburg 2 Nw, 14.8 km from Marienville, elevation 1450 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Cooksburg 2 Nw. 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 7, a growing season of about 143 days.

Median at 36°F
last May 26, first September 27
Median at 32°F
last May 13, first October 7
Median at 28°F
last May 2, first October 20

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

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 18Sep 21Sep 24Sep 27Sep 29Oct 1Oct 3Oct 7
32°FSep 27Sep 30Oct 2Oct 4Oct 7Oct 10Oct 13Oct 16Oct 20
28°FOct 4Oct 9Oct 14Oct 17Oct 20Oct 23Oct 26Oct 30Nov 3
24°FOct 18Oct 25Oct 30Nov 1Nov 3Nov 5Nov 9Nov 12Nov 16
20°FNov 2Nov 5Nov 9Nov 11Nov 14Nov 16Nov 19Nov 23Nov 29
16°FNov 10Nov 14Nov 18Nov 21Nov 24Nov 28Dec 1Dec 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°F141134130126122118114108102
32°F165157152148143139135130124
28°F191183178173169165159153145
24°F219212206202197193188181172
20°F242235231226222218214209203
16°F267257252247243239234228222

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
7,206
Cooling degree days, base 65°F
298
Growing degree days, base 40°F
4,084
Growing degree days, base 45°F
3,037
Growing degree days, base 50°F
2,126
Growing degree days, base 55°F
1,353
Growing degree days, base 60°F
732

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,32800
February1,14100
March1,00008
April605048
May30610215
June8353421
July31115548
August4789507
September19431295
October518277
November81806
December1,13600

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 14.8 km from Marienville. 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 USC00361751 (Cooksburg 2 Nw). Public domain.