December weather forecastMerced, CA
December
Weather in December
December, the first month of the winter in Merced, is still a refreshing month, with an average temperature varying between 41.9°F (5.5°C) and 55.9°F (13.3°C).Temperature
December is the month when Merced experiences its coldest temperatures, averaging a high of 55.9°F (13.3°C) and a low of 41.9°F (5.5°C).Humidity
The average relative humidity in December is 68%.Rainfall
In Merced, in December, during 8.7 rainfall days, 1.89" (48mm) of precipitation is typically accumulated. Throughout the year, in Merced, there are 62.9 rainfall days, and 11.69" (297mm) of precipitation is accumulated.Daylight
The month with the shortest days in Merced, California, is December, with an average of 9h and 36min of daylight.On the first day of December, sunrise is at 6:57 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:54 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 6.1h of sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 3 in December, converts into the following recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Merced, CA
- Average high temperature in December: 55.9°F
The warmest month (with the highest average high temperature) is July (99.1°F).
The month with the lowest average high temperature is December (55.9°F).
- Average low temperature in December: 41.9°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).
Average pressure in December
Merced, CA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Merced, CA
- Average wind speed in December: 5.5mph
The windiest month (with the highest average wind speed) is June (8.3mph).
The calmest months (with the lowest average wind speed) are January and November (5.2mph).
Average humidity in December
Merced, CA
- Average humidity in December: 68%
The month with the highest relative humidity is January (70%).
The month with the lowest relative humidity is July (32%).
Average rainfall in December
Merced, CA
- Average rainfall in December: 1.89"
The wettest month (with the highest rainfall) is March (2.44").
The driest month (with the least rainfall) is August (0.04").
Average rainfall days in December
Merced, CA
- Average rainfall days in December: 8.7 days
The month with the highest number of rainy days is March (11.3 days).
The month with the least rainy days is June (1.1 days).
Average daylight in December /
Average sunshine in December
Merced, CA
- Average daylight in December: 9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 6h and 6min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 6min).
Average sunshine days in December
Merced, CA
- Average sunshine days in December: 21.5 days
The month with the most sunshine days is August (28.8 days).
The month with the least sunshine days is March (18.8 days).
Average UV index in December
Merced, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Merced, CA
- Average cloud cover in December: 31
The month with the most cloud cover is March (Cloud cover 32).
The months with the least cloud cover are July and August (Cloud cover 5).
Average visibility in December
Merced, 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).
