Redwood climate

Redwood Frost Dates and Growing Season

NOAA 1991-2020 normals for Gouverneur 3 Nw, 23.7 km from Redwood, elevation 420 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Gouverneur 3 Nw. 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 14 and the first fall freeze around September 26, a growing season of about 134 days.

Median at 36°F
last May 27, first September 16
Median at 32°F
last May 14, first September 26
Median at 28°F
last May 2, first October 8

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°FJun 10Jun 5Jun 1May 30May 27May 24May 21May 16May 11
32°FMay 30May 24May 20May 17May 14May 11May 8May 4Apr 30
28°FMay 17May 12May 8May 5May 2Apr 30Apr 28Apr 24Apr 21
24°FMay 7May 1Apr 28Apr 24Apr 21Apr 18Apr 16Apr 13Apr 8
20°FApr 22Apr 18Apr 14Apr 11Apr 8Apr 6Apr 4Apr 1Mar 30
16°FApr 13Apr 8Apr 5Apr 3Apr 2Mar 31Mar 29Mar 24Mar 19

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 2Sep 6Sep 10Sep 13Sep 16Sep 19Sep 23Sep 26Sep 30
32°FSep 12Sep 16Sep 20Sep 24Sep 26Sep 30Oct 2Oct 6Oct 12
28°FSep 23Sep 29Oct 2Oct 5Oct 8Oct 12Oct 16Oct 20Oct 27
24°FOct 3Oct 9Oct 15Oct 18Oct 22Oct 25Oct 28Nov 2Nov 6
20°FOct 18Oct 24Oct 28Oct 31Nov 3Nov 6Nov 9Nov 12Nov 19
16°FOct 30Nov 4Nov 7Nov 11Nov 13Nov 16Nov 19Nov 23Nov 28

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°F1311241191151111071039791
32°F154147141137134129125121113
28°F178170164161157152148143136
24°F203197191186181176171165158
20°F226220215210206202197192184
16°F246238233228225220217212205

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
8,153
Cooling degree days, base 65°F
342
Growing degree days, base 40°F
3,915
Growing degree days, base 45°F
2,924
Growing degree days, base 50°F
2,073
Growing degree days, base 55°F
1,350
Growing degree days, base 60°F
763

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,52501
February1,33000
March1,15504
April685134
May35112178
June10464413
July29130566
August49101518
September21732282
October560268
November873010
December1,27701

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 23.7 km from Redwood. 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 USC00303346 (Gouverneur 3 Nw). Public domain.