Bandon climate

Bandon Frost Dates and Growing Season

NOAA 1991-2020 normals for Bandon 2 Nne, 3.5 km from Bandon, elevation 23 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Bandon 2 Nne. 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 9 and the first fall freeze around November 27, a growing season of about 260 days.

Median at 36°F
last April 18, first November 1
Median at 32°F
last March 9, first November 27
Median at 28°F
last January 29, first December 19

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°FMay 9May 1Apr 28Apr 24Apr 18Apr 14Apr 8Apr 2Mar 28
32°FApr 7Mar 31Mar 25Mar 18Mar 9Mar 1Feb 25Feb 17Jan 31
28°FMar 1Feb 22Feb 16Feb 6Jan 29Jan 19Jan 4Dec 22Dec 6
24°FFeb 19Jan 29Jan 15Jan 1Dec 28Dec 20Dec 14Dec 9Dec 4
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°FOct 7Oct 16Oct 22Oct 27Nov 1Nov 4Nov 10Nov 17Nov 27
32°FNov 1Nov 7Nov 14Nov 21Nov 27Dec 1Dec 7Dec 19Jan 8
28°FNov 17Nov 29Dec 5Dec 10Dec 19Jan 1Jan 11Jan 28Feb 16
24°FDec 3Dec 7Dec 11Dec 13Dec 19Dec 28Jan 7Jan 25Feb 17
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°F232221212204198191184174164
32°F309291280271260251242233220
28°F365365362347338330317307291
24°F365365365365365365365365344
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
100% of years
32°F or colder
100% of years
28°F or colder
74% of years
24°F or colder
22% of years
20°F or colder
4% 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
4,297
Cooling degree days, base 65°F
7
Growing degree days, base 40°F
4,854
Growing degree days, base 45°F
3,134
Growing degree days, base 50°F
1,686
Growing degree days, base 55°F
678
Growing degree days, base 60°F
137

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January541031
February477030
March508034
April435053
May3320140
June2210230
July1432324
August1382329
September1912261
October3141162
November441063
December555028

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 3.5 km from Bandon. 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 USC00350471 (Bandon 2 Nne). Public domain.