Myrtle Point climate

Myrtle Point Frost Dates and Growing Season

NOAA 1991-2020 normals for Coquille City, 14.5 km from Myrtle Point, elevation 23 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Coquille 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 March 28 and the first fall freeze around November 6, a growing season of about 225 days.

Median at 36°F
last April 30, first October 18
Median at 32°F
last March 28, first November 6
Median at 28°F
last February 16, first December 2

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 19May 13May 7May 4Apr 30Apr 27Apr 22Apr 16Apr 7
32°FApr 27Apr 16Apr 9Apr 1Mar 28Mar 22Mar 14Mar 2Feb 22
28°FMar 22Mar 6Feb 28Feb 23Feb 16Feb 6Jan 28Jan 13Dec 28
24°FFeb 19Feb 5Jan 15Jan 6Dec 31Dec 25Dec 18Dec 11Dec 2
20°FJan 6Dec 31Dec 29Dec 25Dec 19Dec 16Dec 10Dec 8Dec 4
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°FSep 30Oct 4Oct 8Oct 14Oct 18Oct 22Oct 27Nov 1Nov 9
32°FOct 17Oct 25Oct 29Nov 1Nov 6Nov 12Nov 19Nov 26Dec 6
28°FNov 2Nov 11Nov 19Nov 28Dec 2Dec 8Dec 15Dec 30Jan 13
24°FNov 14Nov 29Dec 5Dec 9Dec 15Dec 21Dec 30Jan 8Feb 8
20°FDec 1Dec 6Dec 9Dec 12Dec 16Dec 21Dec 26Dec 29Jan 1
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°F200190181176170165158151142
32°F269254244234225218210201189
28°F344330317308299287276264248
24°F365365365365361349338328312
20°F365365365365365365365365360
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
96% of years
24°F or colder
54% of years
20°F or colder
11% of years
16°F or colder
3% 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
4,315
Cooling degree days, base 65°F
34
Growing degree days, base 40°F
4,874
Growing degree days, base 45°F
3,212
Growing degree days, base 50°F
1,858
Growing degree days, base 55°F
879
Growing degree days, base 60°F
269

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January592017
February507024
March519039
April434065
May3202158
June2033251
July1069367
August8810388
September1477311
October3082169
November471053
December620017

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 14.5 km from Myrtle Point. 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 USC00351836 (Coquille City). Public domain.