Felida climate

Felida Frost Dates and Growing Season

NOAA 1991-2020 normals for Vancouver 4 Nne, 5.6 km from Felida, elevation 210 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Vancouver 4 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 April 26 and the first fall freeze around October 18, a growing season of about 177 days.

Median at 36°F
last May 10, first October 1
Median at 32°F
last April 26, first October 18
Median at 28°F
last March 30, first November 4

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

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 21Sep 26Sep 29Oct 1Oct 4Oct 7Oct 13Oct 22
32°FOct 1Oct 5Oct 10Oct 14Oct 18Oct 22Oct 27Nov 1Nov 8
28°FOct 16Oct 21Oct 27Oct 31Nov 4Nov 10Nov 15Nov 21Nov 28
24°FOct 28Nov 5Nov 12Nov 21Nov 26Nov 30Dec 4Dec 12Dec 23
20°FNov 12Nov 22Nov 29Dec 5Dec 11Dec 19Dec 27Jan 3Jan 28
16°FNov 24Dec 1Dec 7Dec 13Dec 21Dec 30Jan 9Jan 28Feb 13

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°F167158152147143138132126117
32°F206196189183177171166160153
28°F252240232226221214207199188
24°F308292284277269260252243231
20°F364349335326317309300289276
16°F365365365365359345335325314

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
90% of years
16°F or colder
54% 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
5,295
Cooling degree days, base 65°F
192
Growing degree days, base 40°F
4,327
Growing degree days, base 45°F
2,974
Growing degree days, base 50°F
1,916
Growing degree days, base 55°F
1,112
Growing degree days, base 60°F
538

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January81801
February68502
March637012
April489050
May3095179
June17520297
July6072477
August5774482
September16120311
October425093
November647011
December83201

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 5.6 km from Felida. 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 USC00458773 (Vancouver 4 Nne). Public domain.