Yazoo County climate

Yazoo County Frost Dates and Growing Season

NOAA 1991-2020 normals for Yazoo City 5 Nne, 13.7 km from Yazoo County, elevation 107 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Yazoo City 5 Nne. 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 March 4 and the first fall freeze around November 24, a growing season of about 267 days.

Median at 36°F
last March 18, first November 11
Median at 32°F
last March 4, first November 24
Median at 28°F
last February 15, first December 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°FApr 6Mar 31Mar 26Mar 21Mar 18Mar 13Mar 8Mar 1Feb 24
32°FMar 25Mar 18Mar 13Mar 9Mar 4Feb 28Feb 24Feb 18Feb 7
28°FMar 12Mar 5Feb 28Feb 21Feb 15Feb 8Feb 2Jan 28Jan 17
24°FMar 2Feb 20Feb 10Feb 4Jan 31Jan 28Jan 21Jan 13Dec 31
20°FFeb 24Feb 7Feb 1Jan 29Jan 25Jan 19Jan 15Jan 9Dec 31
16°FFeb 14Feb 2Jan 31Jan 24Jan 19Jan 15Jan 12Jan 7Jan 3

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°FOct 27Nov 1Nov 4Nov 7Nov 11Nov 14Nov 18Nov 23Dec 1
32°FNov 5Nov 10Nov 15Nov 20Nov 24Nov 29Dec 3Dec 7Dec 18
28°FNov 16Nov 26Dec 1Dec 6Dec 13Dec 22Dec 30Jan 5Jan 15
24°FDec 2Dec 15Dec 25Dec 31Jan 2Jan 7Jan 13Jan 22Feb 1
20°FDec 20Dec 31Jan 3Jan 7Jan 11Jan 18Jan 24Jan 31Feb 9
16°FJan 1Jan 5Jan 7Jan 11Jan 14Jan 18Jan 23Feb 1Feb 9

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°F267257250244238233228221214
32°F300288279273267261255247237
28°F335323313305299292285276263
24°F365361350341333325316305295
20°F365365365365365359346334321
16°F365365365365365365365365349

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
98% of years
24°F or colder
84% of years
20°F or colder
48% of years
16°F or colder
18% 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
1,977
Cooling degree days, base 65°F
2,947
Growing degree days, base 40°F
10,167
Growing degree days, base 45°F
8,463
Growing degree days, base 50°F
6,875
Growing degree days, base 55°F
5,422
Growing degree days, base 60°F
4,107

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January52110112
February37814144
March22753320
April68143527
May6333792
June0513963
July06111,076
August06091,074
September2432880
October62178584
November26135260
December45216144

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 13.7 km from Yazoo County. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00229860 (Yazoo City 5 Nne). Public domain.