Holley climate

Holley Frost Dates and Growing Season

NOAA 1991-2020 normals for Chactaw Nolf Milton, 8.4 km from Holley, elevation 102 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Chactaw Nolf Milton. 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 1 and the first fall freeze around November 27, a growing season of about 273 days.

Median at 36°F
last March 16, first November 15
Median at 32°F
last March 1, first November 27
Median at 28°F
last February 9, first December 17

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 6Mar 31Mar 25Mar 20Mar 16Mar 12Mar 7Feb 28Feb 21
32°FMar 23Mar 16Mar 10Mar 6Mar 1Feb 25Feb 18Feb 10Jan 31
28°FMar 11Mar 4Feb 26Feb 17Feb 9Feb 3Jan 29Jan 21Jan 8
24°FFeb 28Feb 13Feb 4Jan 31Jan 27Jan 20Jan 13Jan 6Dec 28
20°FFeb 7Feb 1Jan 27Jan 20Jan 13Jan 8Jan 5Dec 31Dec 21
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°FOct 31Nov 4Nov 7Nov 11Nov 15Nov 18Nov 23Nov 29Dec 6
32°FNov 6Nov 12Nov 17Nov 22Nov 27Dec 2Dec 7Dec 17Dec 31
28°FNov 15Nov 26Dec 2Dec 8Dec 17Dec 27Jan 3Jan 9Jan 21
24°FDec 1Dec 11Dec 23Dec 29Jan 3Jan 9Jan 15Jan 25Feb 3
20°FDec 10Dec 26Jan 1Jan 5Jan 8Jan 13Jan 19Jan 28Feb 3
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°F274263257251244238231226217
32°F311297288281273266258250240
28°F348334325316306299291280265
24°F365365363354345335328316303
20°F365365365365365365361348332
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
100% of years
28°F or colder
95% of years
24°F or colder
70% of years
20°F or colder
31% of years
16°F or colder
6% 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
1,502
Cooling degree days, base 65°F
2,644
Growing degree days, base 40°F
10,294
Growing degree days, base 45°F
8,530
Growing degree days, base 50°F
6,849
Growing degree days, base 55°F
5,292
Growing degree days, base 60°F
3,877

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January41314162
February27815199
March15850366
April49117518
May5294753
June0465915
July05351,000
August0524989
September1411861
October43167590
November19838305
December35716191

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 8.4 km from Holley. 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 USW00053848 (Chactaw Nolf Milton). Public domain.