December weather forecastMoreno Knolls, CA
December
Weather in December
The first month of the winter, December, is still a refreshing month in Moreno Knolls, California, with an average temperature fluctuating between 42.4°F (5.8°C) and 59.9°F (15.5°C).Temperature
Moreno Knolls witnesses the coldest weather in December, with temperatures averaging a high of 59.9°F (15.5°C) and a low of 42.4°F (5.8°C).Humidity
The average relative humidity in December is 54%.Rainfall
The months with the most rainfall are February and December, with an average 1.26" (32mm) of precipitation.Snowfall
In Moreno Knolls, snow does not fall in January, March through December.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 6:36 am and sunset at 4:39 pm. On the last day of December, sunrise is at 6:53 am and sunset at 4:50 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 6.7h of sunshine.UV index
December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In December, the maximum UV index of 3 translates into these guidelines:
Take precautions. Light skin individuals may get burned in less than 30 minutes. To protect against the Sun's most potent rays, avoid direct exposure around midday. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Moreno Knolls, CA
- Average high temperature in December: 59.9°F
The warmest month (with the highest average high temperature) is August (90.5°F).
The month with the lowest average high temperature is December (59.9°F).
- Average low temperature in December: 42.4°F
The month with the highest average low temperature is August (64°F).
The coldest month (with the lowest average low temperature) is December (42.4°F).
Average pressure in December
Moreno Knolls, CA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Moreno Knolls, CA
- Average wind speed in December: 5.1mph
The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in December
Moreno Knolls, CA
- Average humidity in December: 54%
The months with the highest relative humidity are February, March and May (56%).
The month with the lowest relative humidity is August (43%).
Average rainfall in December
Moreno Knolls, CA
- Average rainfall in December: 1.26"
The wettest months (with the highest rainfall) are February and December (1.26").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Moreno Knolls, CA
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.3 days).
Average snowfall in December
Moreno Knolls, CA
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.04").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Moreno Knolls, CA
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is February (0.2 days).
The months with the least snowfall days are January, April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Moreno Knolls, CA
- Average daylight in December: 9h and 54min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 6h and 42min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in December
Moreno Knolls, CA
- Average sunshine days in December: 23.4 days
The month with the most sunshine days is June (27.4 days).
The month with the least sunshine days is February (20.9 days).
Average UV index in December
Moreno Knolls, CA
- Average UV index in December: 3
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Moreno Knolls, CA
- Average cloud cover in December: 23
The month with the most cloud cover is March (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in December
Moreno Knolls, 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).
