December weather forecastCasmalia, CA
December
Weather in December
December, the first month of the winter in Casmalia, is also an enjoyable month, with an average temperature fluctuating between 61.9°F (16.6°C) and 47.7°F (8.7°C).Temperature
December stands out as Casmalia's coldest month, with temperatures ranging between an average high of 61.9°F (16.6°C) and a low of 47.7°F (8.7°C).Humidity
In December, the average relative humidity is 62%.Rainfall
In Casmalia, during December, the rain falls for 5.7 days and regularly aggregates up to 1.02" (26mm) of precipitation. Throughout the year, there are 43.9 rainfall days, and 6.93" (176mm) of precipitation is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 54min of daylight.On the first day of the month, sunrise is at 6:52 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:09 am and sunset at 5:01 pm PST.
Sunshine
The average sunshine in December is 6.6h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index, 4 during December, leads to the following recommendations:
Guard yourself - Avoiding sunburn is suggested. Around midday, solar radiation is most harmful; hence, exposure should be limited. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Casmalia, CA
- Average high temperature in December: 61.9°F
The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (61.9°F).
- Average low temperature in December: 47.7°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 (46.6°F).
Average pressure in December
Casmalia, CA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).
Average wind speed in December
Casmalia, CA
- Average wind speed in December: 6.5mph
The windiest months (with the highest average wind speed) are April and May (7.6mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).
Average humidity in December
Casmalia, CA
- Average humidity in December: 62%
The month with the highest relative humidity is March (68%).
The month with the lowest relative humidity is October (58%).
Average rainfall in December
Casmalia, CA
- Average rainfall in December: 1.02"
The wettest month (with the highest rainfall) is March (1.5").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in December
Casmalia, CA
- Average rainfall days in December: 5.7 days
The month with the highest number of rainy days is March (7.9 days).
The months with the least rainy days are June and August (0.8 days).
Average daylight in December /
Average sunshine in December
Casmalia, CA
- Average daylight in December: 9h and 54min
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 54min).
- Average sunshine in December: 6h and 36min
The months with the most sunshine are June, July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 30min).
Average sunshine days in December
Casmalia, CA
- Average sunshine days in December: 24.5 days
The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is February (21.3 days).
Average UV index in December
Casmalia, CA
- Average UV index in December: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in December
Casmalia, CA
- Average cloud cover in December: 24
The month with the most cloud cover is March (Cloud cover 26).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in December
Casmalia, 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).
