Winlock climate

Winlock Frost Dates and Growing Season

NOAA 1991-2020 normals for Toledo FAA AP, 9.3 km from Winlock, elevation 379 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Toledo FAA AP. 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 5 and the first fall freeze around October 25, a growing season of about 196 days.

Median at 36°F
last May 2, first October 2
Median at 32°F
last April 5, first October 25
Median at 28°F
last March 10, first November 9

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 19May 13May 7May 2Apr 29Apr 25Apr 17Apr 6
32°FMay 4Apr 27Apr 20Apr 13Apr 5Mar 31Mar 27Mar 21Mar 12
28°FApr 8Mar 31Mar 23Mar 16Mar 10Mar 5Feb 28Feb 24Feb 15
24°FMar 13Mar 5Feb 28Feb 25Feb 21Feb 16Feb 8Jan 18Dec 21
20°FFeb 28Feb 22Feb 17Feb 12Feb 1Jan 10Dec 26Dec 11Nov 25
16°FFeb 19Feb 14Feb 2Jan 18Jan 3Dec 27Dec 14Dec 4Nov 22

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 8Sep 15Sep 22Sep 28Oct 2Oct 6Oct 12Oct 19Oct 31
32°FSep 24Oct 2Oct 11Oct 19Oct 25Oct 31Nov 4Nov 11Nov 20
28°FOct 6Oct 20Oct 29Nov 3Nov 9Nov 16Nov 22Nov 30Dec 14
24°FOct 22Nov 2Nov 11Nov 21Nov 26Dec 3Dec 13Dec 28Jan 19
20°FNov 4Nov 17Nov 27Dec 4Dec 13Dec 25Jan 4Jan 30Feb 16
16°FNov 12Nov 26Dec 7Dec 15Dec 27Jan 3Jan 23Feb 10Feb 16

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°F189174166158151143134125112
32°F237224215205196187180169156
28°F288273263253245236226216202
24°F342322310300291281271259242
20°F365365354336327317309299282
16°F365365365365365365351333318

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
96% of years
20°F or colder
76% of years
16°F or colder
40% 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
4,812
Cooling degree days, base 65°F
198
Growing degree days, base 40°F
4,718
Growing degree days, base 45°F
3,257
Growing degree days, base 50°F
2,092
Growing degree days, base 55°F
1,204
Growing degree days, base 60°F
571

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January75603
February62905
March570025
April425073
May2587221
June14521326
July5373485
August4375498
September14322329
October3911114
November618012
December78101

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 9.3 km from Winlock. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USW00024241 (Toledo FAA AP). Public domain.