December weather forecastMountain Mesa, CA
December
Weather in December
December, the first month of the winter in Mountain Mesa, is still a chilly month, with temperature in the range of an average high of 49.3°F (9.6°C) and an average low of 32.4°F (0.2°C).Temperature
Mountain Mesa reaches its lowest average temperatures in December, measuring 49.3°F (9.6°C) at the peak and 32.4°F (0.2°C) at the lowest.Humidity
The average relative humidity in December is 59%.Rainfall
In December, the rain falls for 7.2 days. Throughout December, 1.89" (48mm) of precipitation is accumulated. In Mountain Mesa, during the entire year, the rain falls for 65.1 days and collects up to 12.28" (312mm) of precipitation.Snowfall
Months with snowfall are January through May, November and December. In Mountain Mesa, California, during December, snow falls for 1.8 days and regularly aggregates up to 0.83" (21mm) of snow. In Mountain Mesa, during the entire year, snow falls for 9.3 days and aggregates up to 9.65" (245mm) of snow.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 6:45 am and sunset at 4:40 pm. On the last day of December, sunrise is at 7:03 am and sunset at 4:50 pm PST.
Sunshine
In December, the average sunshine is 6.5h.UV index
The months with the lowest UV index are November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mountain Mesa, CA
- Average high temperature in December: 49.3°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is December (49.3°F).
- Average low temperature in December: 32.4°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is December (32.4°F).
Average pressure in December
Mountain Mesa, CA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Mountain Mesa, CA
- Average wind speed in December: 5.7mph
The windiest month (with the highest average wind speed) is May (7.4mph).
The calmest month (with the lowest average wind speed) is September (5.4mph).
Average humidity in December
Mountain Mesa, CA
- Average humidity in December: 59%
The month with the highest relative humidity is February (61%).
The month with the lowest relative humidity is August (31%).
Average rainfall in December
Mountain Mesa, CA
- Average rainfall in December: 1.89"
The wettest month (with the highest rainfall) is January (2.24").
The driest month (with the least rainfall) is June (0.2").
Average rainfall days in December
Mountain Mesa, CA
- Average rainfall days in December: 7.2 days
The month with the highest number of rainy days is March (10.1 days).
The month with the least rainy days is June (1.5 days).
Average snowfall in December
Mountain Mesa, CA
- Average snowfall in December: 0.83"
The month with the highest snowfall is February (3.98").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Mountain Mesa, CA
- Average snowfall days in December: 1.8 days
The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Mountain Mesa, 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 30min
The months with the most sunshine are June and July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and February (Average sunshine: 6h and 24min).
Average sunshine days in December
Mountain Mesa, CA
- Average sunshine days in December: 22.6 days
The month with the most sunshine days is June (27.4 days).
The month with the least sunshine days is February (19.2 days).
Average UV index in December
Mountain Mesa, CA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are November and December (UV index 2).
Average cloud cover in December
Mountain Mesa, CA
- Average cloud cover in December: 27
The month with the most cloud cover is March (Cloud cover 31).
The months with the least cloud cover are August and September (Cloud cover 6).
Average visibility in December
Mountain Mesa, 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).
