Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
With an average high-temperature of 59.2°F (15.1°C) and an average low-temperature of 48°F (8.9°C), December is the coldest month.Humidity
In December, the average relative humidity in Morro Bay 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 Morro Bay, the average seawater temperature in December is 57.6°F (14.2°C).Note: Swimming in 57.6°F (14.2°C) poses a severe threat. Even short exposure to 55.4°F (13°C) is chilling, and going below 50°F (10°C) can cause breathing irregularities and intense cold shock, based on one's stamina.
Daylight
With an average of 9h and 48min of daylight, December has the shortest days of the year in Morro Bay.On the first day of December, sunrise is at 6:54 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 5:01 pm PST.
Sunshine
The month with the least sunshine in Morro Bay is December, with an average of 6.4h of sunshine.UV index
The months with the lowest UV index are January through April, November and December, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: The average daily UV index of 4 in December transforms into the following instructions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Frequently asked questions
What part of the year is the coldest in Morro Bay?
What is the usual temperature for Morro Bay in December?
What is the average humidity in December in Morro Bay?
How much does it rain in Morro Bay in December?
How cold is the water in December in Morro Bay?
What is the month with the shortest days in Morro Bay?
How many hours of daylight does Morro Bay have in December?
When is the sunrise / sunset in December in Morro Bay?
What is the month with the least sunshine in Morro Bay?
How long on average sun shines in December in Morro Bay?
When is the lowest UV index in Morro Bay?
What is the UV index reading in December in Morro Bay?
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 5min
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 2min
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).
Morro Bay, California, USA
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