Youngstown climate

Youngstown Frost Dates and Growing Season

NOAA 1991-2020 normals for Panama City 5N, 24.9 km from Youngstown, elevation 5 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Panama City 5N. 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 15 and the first fall freeze around December 12, a growing season of about 301 days.

Median at 36°F
last March 2, first November 25
Median at 32°F
last February 15, first December 12
Median at 28°F
last January 31, first January 1

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 24Mar 18Mar 12Mar 6Mar 2Feb 27Feb 22Feb 17Feb 9
32°FMar 11Mar 3Feb 28Feb 21Feb 15Feb 10Feb 4Jan 29Jan 13
28°FFeb 28Feb 17Feb 9Feb 4Jan 31Jan 26Jan 19Jan 10Dec 30
24°FFeb 14Feb 5Feb 1Jan 29Jan 22Jan 14Jan 8Jan 2Dec 26
20°FFeb 3Feb 1Jan 29Jan 26Jan 20Jan 15Jan 12Jan 5Jan 1
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 6Nov 12Nov 17Nov 21Nov 25Nov 29Dec 2Dec 7Dec 18
32°FNov 16Nov 25Dec 1Dec 5Dec 12Dec 19Dec 27Jan 3Jan 12
28°FDec 1Dec 8Dec 17Dec 25Jan 1Jan 4Jan 10Jan 19Feb 1
24°FDec 19Dec 27Jan 1Jan 4Jan 8Jan 13Jan 20Jan 29Feb 4
20°FDec 28Jan 2Jan 7Jan 13Jan 15Jan 22Jan 27Jan 31Feb 2
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°F299287278272265260253247239
32°F335324314307301294284276263
28°F365358347338334326318309298
24°F365365365365365359349339329
20°F365365365365365365365365357
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
100% of years
32°F or colder
98% of years
28°F or colder
84% of years
24°F or colder
49% of years
20°F or colder
14% of years
16°F or colder
1% 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
1,288
Cooling degree days, base 65°F
2,903
Growing degree days, base 40°F
10,754
Growing degree days, base 45°F
8,970
Growing degree days, base 50°F
7,249
Growing degree days, base 55°F
5,643
Growing degree days, base 60°F
4,186

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January36913177
February24816215
March14255385
April38135548
May3327789
June0483933
July05601,025
August05521,017
September0451901
October27235673
November15455360
December30621227

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 24.9 km from Youngstown. 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 USC00086842 (Panama City 5N). Public domain.