Canby climate

Canby Frost Dates and Growing Season

NOAA 1991-2020 normals for Canby, 1.1 km from Canby, elevation 1210 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Canby. 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 May 2 and the first fall freeze around October 5, a growing season of about 156 days.

Median at 36°F
last May 11, first September 28
Median at 32°F
last May 2, first October 5
Median at 28°F
last April 24, first October 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°FMay 25May 21May 17May 14May 11May 8May 6May 3Apr 30
32°FMay 14May 10May 7May 4May 2Apr 30Apr 28Apr 24Apr 20
28°FMay 6May 2Apr 30Apr 26Apr 24Apr 21Apr 18Apr 15Apr 10
24°FApr 29Apr 24Apr 20Apr 17Apr 14Apr 11Apr 8Apr 5Apr 2
20°FApr 19Apr 15Apr 10Apr 7Apr 5Apr 3Mar 31Mar 28Mar 21
16°FApr 10Apr 5Apr 2Mar 31Mar 29Mar 25Mar 21Mar 17Mar 11

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 14Sep 19Sep 22Sep 25Sep 28Sep 30Oct 2Oct 6Oct 10
32°FSep 23Sep 28Oct 1Oct 2Oct 5Oct 8Oct 11Oct 15Oct 19
28°FOct 2Oct 7Oct 11Oct 14Oct 17Oct 20Oct 23Oct 26Oct 31
24°FOct 13Oct 18Oct 22Oct 25Oct 27Oct 30Nov 1Nov 4Nov 9
20°FOct 22Oct 27Oct 30Nov 1Nov 4Nov 7Nov 10Nov 14Nov 19
16°FOct 31Nov 2Nov 6Nov 9Nov 12Nov 15Nov 18Nov 22Nov 27

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°F155149145142138135131126120
32°F175168164160156152148144138
28°F196189183179175171167162155
24°F215208203199195191187182176
20°F233226221216211207202198192
16°F251243238233229224219214208

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
100% of years
20°F or colder
100% of years
16°F or colder
100% 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
7,995
Cooling degree days, base 65°F
644
Growing degree days, base 40°F
4,532
Growing degree days, base 45°F
3,524
Growing degree days, base 50°F
2,626
Growing degree days, base 55°F
1,841
Growing degree days, base 60°F
1,176

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,56800
February1,29900
March1,07608
April633257
May27834260
June53134532
July11235690
August24173614
September16361359
October540597
November963011
December1,38700

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 1.1 km from Canby. 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 USC00211263 (Canby). Public domain.