Chauvin climate

Chauvin Frost Dates and Growing Season

NOAA 1991-2020 normals for Galliano, 28 km from Chauvin, elevation 5 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Galliano. 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 February 8 and the first fall freeze around December 19, a growing season of about 311 days.

Median at 36°F
last February 28, first December 1
Median at 32°F
last February 8, first December 19
Median at 28°F
last January 28, first January 3

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°FMar 21Mar 14Mar 9Mar 3Feb 28Feb 22Feb 15Feb 6Jan 29
32°FMar 12Mar 2Feb 24Feb 16Feb 8Feb 1Jan 29Jan 22Jan 11
28°FMar 1Feb 19Feb 9Feb 1Jan 28Jan 22Jan 13Jan 5Dec 27
24°FFeb 22Feb 8Jan 31Jan 27Jan 20Jan 14Jan 9Jan 1Dec 23
20°FFeb 12Feb 4Feb 1Jan 28Jan 19Jan 11Jan 9Jan 4Dec 28
16°F–––––––––

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°FNov 12Nov 17Nov 22Nov 26Dec 1Dec 4Dec 9Dec 18Dec 29
32°FNov 20Nov 30Dec 5Dec 12Dec 19Dec 27Jan 2Jan 9Jan 22
28°FDec 3Dec 11Dec 23Dec 31Jan 3Jan 8Jan 15Jan 24Feb 4
24°FDec 13Dec 25Jan 1Jan 4Jan 8Jan 14Jan 23Feb 1Feb 10
20°FDec 28Jan 2Jan 7Jan 10Jan 18Jan 26Feb 1Feb 1Feb 10
16°F–––––––––

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°F312300291285279273264257247
32°F350337330320311304296286273
28°F365365363354343335329316302
24°F365365365365365365361346334
20°F365365365365365365365365365
16°F365365365365365365365365365

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
95% of years
28°F or colder
74% of years
24°F or colder
38% of years
20°F or colder
11% of years
16°F or colder
1% 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
1,267
Cooling degree days, base 65°F
2,886
Growing degree days, base 40°F
10,760
Growing degree days, base 45°F
8,978
Growing degree days, base 50°F
7,261
Growing degree days, base 55°F
5,652
Growing degree days, base 60°F
4,187

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January36116189
February24427235
March13573411
April40148559
May2329792
June0475925
July05411,006
August05431,007
September0431880
October28220658
November15758363
December30026235

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 km from Chauvin. 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 USC00163433 (Galliano). Public domain.