December weather forecastMorro Bay, CA
December
Weather in December
December, the first month of the winter in Morro Bay, is still a mild month, with an average temperature fluctuating between 59.2°F (15.1°C) and 48°F (8.9°C).Temperature
The coldest month is December, with an average high-temperature of 59.2°F (15.1°C) and an average low-temperature of 48°F (8.9°C).Humidity
In Morro Bay, the average relative humidity in December is 66%.Rainfall
In Morro Bay, in December, during 7.3 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. In Morro Bay, California, during the entire year, the rain falls for 53.7 days and collects up to 8.58" (218mm) of precipitation.Ocean temperature
In December, the average ocean temperature is 57.6°F (14.2°C).Note: To swim in 57.6°F (14.2°C) at less than 50°F (10°C), ensure you're well-protected. Without it, be prepared for a sudden jolt of cold and breathing issues. Remember, even 55.4°F (13°C) is not welcoming.
Daylight
With an average of 9h and 48min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:54 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:12 am and sunset at 5:01 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 6.4h of sunshine.UV index
January through April, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 in December interprets into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Morro Bay, CA
- Average high temperature in December: 59.2°F
The warmest month (with the highest average high temperature) is September (76.3°F).
The month with the lowest average high temperature is December (59.2°F).
- Average low temperature in December: 48°F
The month with the highest average low temperature is September (59.9°F).
The coldest month (with the lowest average low temperature) is February (47.3°F).
Average pressure in December
Morro Bay, CA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are June and September (29.91"Hg).
Average wind speed in December
Morro Bay, CA
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is May (7.9mph).
The calmest months (with the lowest average wind speed) are August and September (6mph).
Average humidity in December
Morro Bay, CA
- Average humidity in December: 66%
The month with the highest relative humidity is March (70%).
The months with the lowest relative humidity are September and October (61%).
Average rainfall in December
Morro Bay, CA
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is January (1.81").
The driest month (with the least rainfall) is August (0.04").
Average rainfall days in December
Morro Bay, CA
- Average rainfall days in December: 7.3 days
The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is August (0.7 days).
Average sea temperature in December
Morro Bay, CA
- Average sea temperature in December: 57.5°F
The best months for swimming (with the highest average sea temperature) are August and October (58.6°F).
The coldest month (with the lowest average sea temperature) is April (54.3°F).
Average daylight in December /
Average sunshine in December
Morro Bay, CA
- Average daylight in December: 9h and 48min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in December: 6h and 24min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in December
Morro Bay, CA
- Average sunshine days in December: 22.5 days
The month with the most sunshine days is August (28.8 days).
The month with the least sunshine days is February (20.1 days).
Average UV index in December
Morro Bay, CA
- Average UV index in December: 4
The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January, February, March, April, November and December (UV index 4).
Average cloud cover in December
Morro Bay, CA
- Average cloud cover in December: 26
The month with the most cloud cover is March (Cloud cover 28).
The months with the least cloud cover are August and September (Cloud cover 7).
Average visibility in December
Morro Bay, CA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
