Bloomingdale climate

Bloomingdale Frost Dates and Growing Season

NOAA 1991-2020 normals for Plant City, 17.3 km from Bloomingdale, elevation 110 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Plant City. 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 January 30 and the first fall freeze around January 6, a growing season of about 335 days.

Median at 36°F
last February 16, first December 25
Median at 32°F
last January 30, first January 6
Median at 28°F
last January 20, first January 11

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 17Mar 7Feb 28Feb 23Feb 16Feb 9Feb 2Jan 29Jan 17
32°FMar 2Feb 20Feb 9Feb 3Jan 30Jan 24Jan 16Jan 9Dec 31
28°FFeb 10Feb 1Jan 29Jan 24Jan 20Jan 13Jan 8Jan 4Dec 29
24°FJan 29Jan 23Jan 17Jan 11Jan 9Jan 6Jan 2Dec 30Dec 20
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 27Dec 4Dec 10Dec 18Dec 25Dec 31Jan 4Jan 10Jan 22
32°FDec 8Dec 19Dec 28Jan 1Jan 6Jan 11Jan 19Jan 26Feb 5
28°FDec 19Dec 29Jan 2Jan 7Jan 11Jan 17Jan 23Jan 28Feb 4
24°FDec 20Dec 28Jan 1Jan 5Jan 8Jan 10Jan 17Jan 22Jan 27
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°F336326317310303296288279269
32°F365362351342335329322312302
28°F365365365365365363355344332
24°F365365365365365365365365357
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
98% of years
32°F or colder
81% of years
28°F or colder
40% of years
24°F or colder
13% 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
436
Cooling degree days, base 65°F
3,848
Growing degree days, base 40°F
12,537
Growing degree days, base 45°F
10,716
Growing degree days, base 50°F
8,907
Growing degree days, base 55°F
7,131
Growing degree days, base 60°F
5,431

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January15070395
February8695431
March47160579
April8265707
May0425890
June0522972
July05771,042
August05771,042
September0517968
October4367828
November36168582
December104106472

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 17.3 km from Bloomingdale. 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 USC00087205 (Plant City). Public domain.