Hayti climate

Hayti Frost Dates and Growing Season

NOAA 1991-2020 normals for Caruthersville, 9.5 km from Hayti, elevation 270 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Caruthersville. 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 24 and the first fall freeze around November 9, a growing season of about 230 days.

Median at 36°F
last April 3, first October 29
Median at 32°F
last March 24, first November 9
Median at 28°F
last March 12, first November 22

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 18Apr 12Apr 9Apr 6Apr 3Apr 1Mar 29Mar 25Mar 19
32°FApr 8Apr 3Mar 31Mar 28Mar 24Mar 20Mar 17Mar 13Mar 7
28°FMar 28Mar 22Mar 18Mar 15Mar 12Mar 7Mar 4Mar 1Feb 22
24°FMar 18Mar 13Mar 8Mar 4Mar 2Feb 26Feb 20Feb 13Feb 3
20°FMar 9Mar 3Feb 27Feb 22Feb 16Feb 10Feb 4Jan 31Jan 21
16°FMar 1Feb 21Feb 13Feb 6Feb 2Jan 30Jan 23Jan 17Jan 8

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 17Oct 21Oct 25Oct 27Oct 29Nov 1Nov 4Nov 8Nov 14
32°FOct 26Oct 30Nov 1Nov 5Nov 9Nov 12Nov 17Nov 22Dec 1
28°FNov 3Nov 10Nov 15Nov 19Nov 22Nov 27Dec 1Dec 6Dec 11
24°FNov 14Nov 21Nov 27Dec 1Dec 5Dec 10Dec 14Dec 21Dec 28
20°FNov 27Dec 5Dec 11Dec 18Dec 24Dec 29Jan 2Jan 9Jan 18
16°FDec 11Dec 21Dec 28Jan 1Jan 5Jan 10Jan 16Jan 22Feb 1

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°F231223217213208205201196190
32°F255247241236230226221214207
28°F282272266260254248243238229
24°F310300292286280274269262251
20°F339329320313308301296287276
16°F365357347340334327319311301

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
99% of years
16°F or colder
89% 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
3,595
Cooling degree days, base 65°F
1,908
Growing degree days, base 40°F
7,832
Growing degree days, base 45°F
6,357
Growing degree days, base 50°F
5,035
Growing degree days, base 55°F
3,853
Growing degree days, base 60°F
2,810

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January842020
February647029
March4777117
April19052333
May35183612
June2390838
July0501965
August0451916
September18253685
October17364372
November4647118
December747028

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 9.5 km from Hayti. 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 USC00231364 (Caruthersville). Public domain.