Sublimity climate

Sublimity Frost Dates and Growing Season

NOAA 1991-2020 normals for Stayton, 4.8 km from Sublimity, elevation 425 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Stayton. 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 29 and the first fall freeze around November 6, a growing season of about 222 days.

Median at 36°F
last April 26, first October 22
Median at 32°F
last March 29, first November 6
Median at 28°F
last March 1, first November 22

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 12May 6May 2Apr 30Apr 26Apr 22Apr 18Apr 12Apr 5
32°FApr 18Apr 9Apr 4Mar 31Mar 29Mar 25Mar 20Mar 14Mar 5
28°FMar 26Mar 19Mar 13Mar 7Mar 1Feb 26Feb 20Feb 13Feb 1
24°FMar 1Feb 23Feb 15Feb 8Jan 31Jan 20Jan 10Jan 1Dec 17
20°FFeb 10Feb 1Jan 21Jan 10Jan 3Dec 30Dec 22Dec 14Dec 3
16°FFeb 7Jan 28Jan 9Jan 1Dec 29Dec 24Dec 20Dec 15Dec 9

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 4Oct 11Oct 15Oct 18Oct 22Oct 25Oct 28Nov 1Nov 10
32°FOct 20Oct 26Oct 30Nov 2Nov 6Nov 10Nov 14Nov 20Nov 26
28°FNov 1Nov 7Nov 12Nov 17Nov 22Nov 27Dec 2Dec 9Dec 18
24°FNov 14Nov 23Nov 29Dec 5Dec 10Dec 17Dec 25Jan 3Jan 17
20°FNov 23Dec 2Dec 8Dec 12Dec 21Dec 27Jan 1Jan 12Feb 1
16°FDec 5Dec 9Dec 14Dec 20Dec 23Dec 29Jan 1Jan 15Feb 2

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°F205195188181177173168162152
32°F255243233227222216210204194
28°F309295283275267259252244231
24°F362346334326317309301290275
20°F365365365365358347338332317
16°F365365365365365365365359339

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
100% of years
24°F or colder
91% of years
20°F or colder
58% of years
16°F or colder
22% 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
4,708
Cooling degree days, base 65°F
269
Growing degree days, base 40°F
4,897
Growing degree days, base 45°F
3,433
Growing degree days, base 50°F
2,257
Growing degree days, base 55°F
1,362
Growing degree days, base 60°F
697

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January75505
February62306
March583023
April435071
May2767207
June13429345
July33101533
August3297530
September11133373
October3632137
November594022
December77005

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 4.8 km from Sublimity. 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 USC00358095 (Stayton). Public domain.