Brookland climate

Brookland Frost Dates and Growing Season

NOAA 1991-2020 normals for Jonesboro 2 Ne, 9 km from Brookland, elevation 310 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Jonesboro 2 Ne. 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 April 1 and the first fall freeze around November 1, a growing season of about 215 days.

Median at 36°F
last April 12, first October 23
Median at 32°F
last April 1, first November 1
Median at 28°F
last March 20, first November 10

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 30Apr 24Apr 19Apr 15Apr 12Apr 9Apr 6Apr 2Mar 27
32°FApr 18Apr 11Apr 7Apr 5Apr 1Mar 29Mar 25Mar 21Mar 15
28°FApr 6Apr 1Mar 28Mar 23Mar 20Mar 16Mar 13Mar 7Mar 1
24°FMar 27Mar 20Mar 16Mar 12Mar 8Mar 4Feb 28Feb 25Feb 18
20°FMar 17Mar 12Mar 6Mar 2Feb 28Feb 22Feb 16Feb 9Jan 31
16°FMar 10Mar 2Feb 25Feb 18Feb 12Feb 5Jan 31Jan 25Jan 13

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 12Oct 16Oct 19Oct 21Oct 23Oct 25Oct 28Oct 30Nov 3
32°FOct 21Oct 24Oct 27Oct 30Nov 1Nov 3Nov 6Nov 10Nov 16
28°FOct 29Nov 1Nov 4Nov 7Nov 10Nov 15Nov 19Nov 24Dec 1
24°FNov 4Nov 9Nov 14Nov 18Nov 22Nov 26Dec 1Dec 5Dec 13
20°FNov 13Nov 21Nov 27Dec 1Dec 5Dec 10Dec 18Dec 25Jan 1
16°FNov 28Dec 5Dec 11Dec 20Dec 25Dec 30Jan 2Jan 8Jan 17

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°F214206202199194190186181173
32°F238229224219215211206201193
28°F262253247241237232228223215
24°F285276270264259254248242234
20°F317305297290284278270263254
16°F342333325319311305298290278

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
98% 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
3,877
Cooling degree days, base 65°F
1,686
Growing degree days, base 40°F
7,435
Growing degree days, base 45°F
5,998
Growing degree days, base 50°F
4,706
Growing degree days, base 55°F
3,557
Growing degree days, base 60°F
2,550

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January894015
February691027
March5015110
April21137298
May54153565
June2351799
July0454919
August0419883
September22217645
October19548335
November514488
December795022

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 km from Brookland. 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 USC00033734 (Jonesboro 2 Ne). Public domain.