December weather forecastWestport, WA
December
Weather in December
The first month of the winter, December, is also a frosty month in Westport, Washington, with an average temperature fluctuating between 45.1°F (7.3°C) and 37.6°F (3.1°C).Temperature
With average high temperatures of 45.1°F (7.3°C) and lows of 37.6°F (3.1°C), December is the coldest month.Humidity
November and December, with an average relative humidity of 87%, are the most humid months.Rainfall
The month with the most rainfall in Westport is December, when the rain falls for 20.3 days and typically aggregates up to 7.99" (203mm) of precipitation.Snowfall
In Westport, snow does not fall in April through October and December.Ocean temperature
In Westport, the average seawater temperature in December is 49.6°F (9.8°C).Note: In 49.6°F (9.8°C), cold shock and rapid breathing can occur when swimming at temperatures below 50°F (10°C).
Daylight
The month with the shortest days is December, with an average of 8h and 36min of daylight.On the first day of December, sunrise is at 7:41 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 8:01 am and sunset at 4:37 pm PST.
Sunshine
In Westport, Washington, the average sunshine in December is 3.6h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum UV index, 2 during December, leads to the following recommendations:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Westport, WA
- Average high temperature in December: 45.1°F
The warmest month (with the highest average high temperature) is August (69.4°F).
The month with the lowest average high temperature is December (45.1°F).
- Average low temperature in December: 37.6°F
The month with the highest average low temperature is August (52°F).
The coldest month (with the lowest average low temperature) is December (37.6°F).
Average pressure in December
Westport, WA
- Average pressure in December: 30.05"Hg
The month with the highest atmospheric pressure is July (30.08"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).
Average wind speed in December
Westport, WA
- Average wind speed in December: 7.6mph
The windiest month (with the highest average wind speed) is January (8.2mph).
The calmest month (with the lowest average wind speed) is September (5.3mph).
Average humidity in December
Westport, WA
- Average humidity in December: 87%
The months with the highest relative humidity are November and December (87%).
The month with the lowest relative humidity is July (79%).
Average rainfall in December
Westport, WA
- Average rainfall in December: 7.99"
The wettest month (with the highest rainfall) is December (7.99").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Westport, WA
- Average rainfall days in December: 20.3 days
The month with the highest number of rainy days is March (21.8 days).
The month with the least rainy days is August (6.7 days).
Average snowfall in December
Westport, WA
- Average snowfall in December: 0"
The month with the highest snowfall is February (1.46").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").
Average snowfall days in December
Westport, WA
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is February (2 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average sea temperature in December
Westport, WA
- Average sea temperature in December: 49.6°F
The best month for swimming (with the highest average sea temperature) is July (57.7°F).
The coldest month (with the lowest average sea temperature) is February (47.6°F).
Average daylight in December /
Average sunshine in December
Westport, WA
- Average daylight in December: 8h and 36min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 3h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Westport, WA
- Average sunshine days in December: 9.1 days
The month with the most sunshine days is August (21.4 days).
The months with the least sunshine days are February and November (8 days).
Average UV index in December
Westport, WA
- Average UV index in December: 2
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Westport, WA
- Average cloud cover in December: 62
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is July (Cloud cover 36).
Average visibility in December
Westport, WA
- Average visibility in December: 5mi
The months with the highest visibility are March and April (6mi).
The month with the lowest visibility is August (4mi).
