Brooksville climate

Brooksville Frost Dates and Growing Season

NOAA 1991-2020 normals for Brooksville Chin Hill, 7.1 km from Brooksville, elevation 240 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Brooksville Chin Hill. 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 3 and the first fall freeze around January 3, a growing season of about 329 days.

Median at 36°F
last February 17, first December 14
Median at 32°F
last February 3, first January 3
Median at 28°F
last January 24, first January 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°FMar 16Mar 6Feb 28Feb 23Feb 17Feb 11Feb 6Jan 30Jan 18
32°FMar 3Feb 23Feb 15Feb 8Feb 3Jan 27Jan 19Jan 11Jan 1
28°FFeb 22Feb 13Feb 5Jan 30Jan 24Jan 16Jan 10Jan 3Dec 27
24°FFeb 12Feb 5Jan 31Jan 24Jan 18Jan 10Jan 4Dec 31Dec 26
20°F–––––––––
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 18Nov 29Dec 4Dec 9Dec 14Dec 20Dec 27Jan 5Jan 16
32°FDec 7Dec 15Dec 21Dec 28Jan 3Jan 9Jan 16Jan 25Feb 4
28°FDec 18Dec 26Jan 1Jan 6Jan 13Jan 19Jan 27Feb 3Feb 12
24°FDec 22Dec 29Jan 1Jan 6Jan 14Jan 22Jan 30Feb 5Feb 10
20°F–––––––––
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°F333321313306299291283275262
32°F365354343335329322314306294
28°F365365365365362353340331319
24°F365365365365365365365365348
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
99% of years
32°F or colder
86% of years
28°F or colder
50% of years
24°F or colder
15% of years
20°F or colder
2% of years
16°F or colder
0% 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
621
Cooling degree days, base 65°F
3,224
Growing degree days, base 40°F
11,732
Growing degree days, base 45°F
9,917
Growing degree days, base 50°F
8,124
Growing degree days, base 55°F
6,382
Growing degree days, base 60°F
4,731

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January20042329
February12453355
March63112517
April14212648
May1370834
June0462912
July0513978
August0516981
September0456906
October8307764
November58120513
December15462387

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 7.1 km from Brooksville. 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 USC00081046 (Brooksville Chin Hill). Public domain.