December weather forecastCoos Bay, OR
December
Weather in December
Finally, December rolls in, marking the advent of winter in Coos Bay. Seeing the highest rainfall of the year at 5.87" (149mm), the city is frequently under cloudy skies. Notably, the wind, bearing a cold snap, reaches its strongest speed in this month. With the shortest days and lack of sunshine, December presents a profound change in the weather. As the year concludes, Coos Bay braces itself for the chill of winter.Temperature
Coos Bay's temperature records reveal December as the coldest month, marked by average highs of 49.1°F (9.5°C) and lows of 41.7°F (5.4°C).Humidity
In December, the average relative humidity is 82%.Rainfall
The month with the most rainfall is December, when the rain falls for 18.6 days and typically aggregates up to 5.87" (149mm) of precipitation.Snowfall
March through October and December are months without snowfall.Daylight
December has the shortest days of the year in Coos Bay, with an average of 9h and 0min of daylight.On the first day of the month, sunrise is at 7:30 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:49 am and sunset at 4:51 pm PST.
Sunshine
In Coos Bay, the average sunshine in December is 4.5h.UV index
The months with the lowest UV index are February and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 2 in December translates into these instructions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Coos Bay, OR
- Average high temperature in December: 49.1°F
The warmest month (with the highest average high temperature) is August (66.9°F).
The month with the lowest average high temperature is December (49.1°F).
- Average low temperature in December: 41.7°F
The month with the highest average low temperature is August (52.3°F).
The coldest months (with the lowest average low temperature) are February and December (41.7°F).
Average pressure in December
Coos Bay, OR
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is September (30.01"Hg).
Average wind speed in December
Coos Bay, OR
- Average wind speed in December: 8.8mph
The windiest month (with the highest average wind speed) is March (9.1mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in December
Coos Bay, OR
- Average humidity in December: 82%
The months with the highest relative humidity are February and August (84%).
The months with the lowest relative humidity are April and October (81%).
Average rainfall in December
Coos Bay, OR
- Average rainfall in December: 5.87"
The wettest month (with the highest rainfall) is December (5.87").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in December
Coos Bay, OR
- Average rainfall days in December: 18.6 days
The month with the highest number of rainy days is March (19.2 days).
The month with the least rainy days is August (3.5 days).
Average snowfall in December
Coos Bay, OR
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.2").
The months with the least snowfall are March, April, May, June, July, August, September, October and December (0").
Average snowfall days in December
Coos Bay, OR
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Coos Bay, OR
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 4h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January and February (Average sunshine: 4h and 24min).
Average sunshine days in December
Coos Bay, OR
- Average sunshine days in December: 10.8 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is February (9.7 days).
Average UV index in December
Coos Bay, OR
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are February and December (UV index 2).
Average cloud cover in December
Coos Bay, OR
- Average cloud cover in December: 53
The month with the most cloud cover is February (Cloud cover 56).
The months with the least cloud cover are July and September (Cloud cover 28).
Average visibility in December
Coos Bay, OR
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
