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Sea Ranch Sea Temperature in December

California, United States

November Sea Ranch year-round → January

Average sea temperature for Sea Ranch, United States across December, based on 10 years of daily readings.

Average

12.29° C

High

14.22° C

Low

10.46° C

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a real risk.

December is the 5th warmest of 12 months at Sea Ranch. On average the water sits 0.3° than the year-round mean of 11.97° C.

Compared to November, December is 0.7° cooler than (13.02° C in November). By January the water is usually 12.08° C.

Sea Ranch Day-by-Day Water Temperature in December

10-year low, average and high

9.5° C
10.9° C
12.3° C
13.6° C
15.0° C
1
5
10
15
20
25
31
Day-by-day low and high band with the 10-year daily average through December. Range Average

Each vertical bar above is one day of December. The shaded band covers the range the water has reached on that day across the last 10 years — the lowest reading at the bottom, the highest at the top. The line running through the bars is the daily average over those 10 years, so you can see the typical shape of the month at Sea Ranch.

A narrow band means the temperature on that day has stayed close to the average year on year. A taller band means it has swung more, often because of changeable weather around that time of year. Hovering a day pulls up its low, average, and high.

December Water Temperature Table for Sea Ranch

10-year daily averages

Day Average Low High
December 1 12.68° C 10.84° C 13.56° C
December 2 12.7° C 11.1° C 13.64° C
December 3 12.69° C 11.15° C 13.79° C
December 4 12.63° C 11.19° C 13.86° C
December 5 12.61° C 11.25° C 13.88° C
December 6 12.53° C 11.2° C 13.96° C
December 7 12.53° C 10.96° C 13.86° C
December 8 12.48° C 10.84° C 13.76° C
December 9 12.5° C 11.07° C 13.57° C
December 10 12.48° C 11.06° C 13.52° C
December 11 12.45° C 10.9° C 13.53° C
December 12 12.32° C 10.82° C 13.45° C
December 13 12.31° C 10.87° C 13.55° C
December 14 12.28° C 10.86° C 13.5° C
December 15 12.23° C 10.86° C 13.66° C
December 16 12.24° C 10.8° C 13.96° C
December 17 12.19° C 10.9° C 13.95° C
December 18 12.17° C 10.82° C 13.92° C
December 19 12.21° C 10.82° C 14.18° C
December 20 12.23° C 10.93° C 14.22° C
December 21 12.21° C 10.92° C 14.08° C
December 22 12.19° C 10.87° C 14.06° C
December 23 12.1° C 10.75° C 14.18° C
December 24 12.03° C 10.61° C 13.81° C
December 25 11.99° C 10.48° C 13.68° C
December 26 12° C 10.46° C 13.41° C
December 27 12.04° C 10.53° C 13.45° C
December 28 11.99° C 10.75° C 13.71° C
December 29 12.07° C 10.83° C 13.7° C
December 30 12.04° C 10.74° C 13.51° C
December 31 11.92° C 10.61° C 13.52° C

Where December Sits in the Year

December highlighted

7.0° C
9.8° C
12.5° C
15.3° C
18.0° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
12.08° C
11.78° C
11.32° C
10.98° C
10.78° C
11.06° C
11.53° C
12.68° C
13.24° C
12.94° C
13.02° C
12.29° C
10-year monthly history for Sea Ranch. Bars span historical low to high; the line marks the monthly average. Range Average
January → February → March → April → May → June → July → August → September → October → November → December →

Nearby Locations in December

Compare other United States water for the same month

Sea Ranch Location

38.7152, -123.4545

38.71519, -123.45445 View on OpenStreetMap →

Sea Ranch sits at 38.7152°N, 123.4545°W, on the coast of California, United States. The marker on the map shows the spot the readings on this page come from. It usually sits a short distance from the town centre, out on the open water itself, so the numbers stay tied to the coast rather than a generic point inland.

Coastlines bend, headlands focus the water, and the temperature can run noticeably differently between two beaches that look close together on a map. Comparing nearby locations is a quick way to see how local geography is shaping the readings.

Nearest locations to Sea Ranch