Halls climate

Halls Frost Dates and Growing Season

NOAA 1991-2020 normals for Dyersburg, 13.7 km from Halls, elevation 300 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Dyersburg. 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 31 and the first fall freeze around November 6, a growing season of about 224 days.

Median at 36°F
last April 10, first October 26
Median at 32°F
last March 31, first November 6
Median at 28°F
last March 17, first November 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°FApr 26Apr 20Apr 16Apr 13Apr 10Apr 7Apr 5Apr 2Mar 25
32°FApr 14Apr 8Apr 5Apr 3Mar 31Mar 27Mar 23Mar 19Mar 12
28°FApr 3Mar 29Mar 24Mar 20Mar 17Mar 13Mar 8Mar 4Feb 28
24°FMar 21Mar 17Mar 12Mar 8Mar 4Feb 28Feb 23Feb 16Feb 8
20°FMar 13Mar 6Mar 1Feb 25Feb 19Feb 12Feb 6Jan 31Jan 22
16°FMar 5Feb 24Feb 16Feb 8Feb 3Jan 30Jan 25Jan 16Jan 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 13Oct 17Oct 20Oct 23Oct 26Oct 28Oct 31Nov 3Nov 8
32°FOct 23Oct 28Oct 31Nov 3Nov 6Nov 10Nov 13Nov 19Nov 24
28°FNov 2Nov 7Nov 12Nov 17Nov 20Nov 24Nov 29Dec 3Dec 9
24°FNov 13Nov 20Nov 25Nov 30Dec 2Dec 6Dec 11Dec 18Dec 25
20°FNov 25Dec 1Dec 6Dec 12Dec 18Dec 23Dec 28Jan 2Jan 10
16°FDec 9Dec 16Dec 23Dec 29Jan 1Jan 5Jan 10Jan 17Jan 28

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°F220212207203199195190186180
32°F247239233228224219213208201
28°F275265259252248244237231222
24°F301291284277272266261255246
20°F332322313306299292287279269
16°F361348340334328321312304293

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
94% 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
3,887
Cooling degree days, base 65°F
1,633
Growing degree days, base 40°F
7,397
Growing degree days, base 45°F
5,957
Growing degree days, base 50°F
4,657
Growing degree days, base 55°F
3,501
Growing degree days, base 60°F
2,496

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January899014
February698032
March5059121
April21936293
May62153557
June1322771
July0435900
August0408872
September23216643
October20249328
November498697
December783028

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 Halls. 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 USC00402680 (Dyersburg). Public domain.