December weather forecastRancho Santa Margarita, CA
December
Weather in December
December, the first month of the winter in Rancho Santa Margarita, is still a refreshing month, with an average temperature ranging between min 49.8°F (9.9°C) and max 63°F (17.2°C).Temperature
Rancho Santa Margarita reaches its lowest average temperatures in December, measuring 63°F (17.2°C) at the peak and 49.8°F (9.9°C) at the lowest.Humidity
In Rancho Santa Margarita, the average relative humidity in December is 60%.Rainfall
December is the month with the most rainfall. Rain falls for 6.7 days and accumulates 1.02" (26mm) of precipitation.Daylight
The month with the shortest days is December, with an average of 10h and 0min of daylight.On the first day of December, sunrise is at 6:37 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 4:52 pm PST.
Sunshine
With an average of 6.6h of sunshine, December has the least sunshine of the year.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 value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: In December, an average UV index of 4 transforms into the following instructions:
Ensure safety - Sun damage prevention is strongly urged. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Rancho Santa Margarita, CA
- Average high temperature in December: 63°F
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (63°F).
- Average low temperature in December: 49.8°F
The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is February (48.9°F).
Average pressure in December
Rancho Santa Margarita, CA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).
Average wind speed in December
Rancho Santa Margarita, CA
- Average wind speed in December: 5mph
The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in December
Rancho Santa Margarita, CA
- Average humidity in December: 60%
The months with the highest relative humidity are May and June (70%).
The month with the lowest relative humidity is November (56%).
Average rainfall in December
Rancho Santa Margarita, CA
- Average rainfall in December: 1.02"
The wettest month (with the highest rainfall) is December (1.02").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in December
Rancho Santa Margarita, CA
- Average rainfall days in December: 6.7 days
The month with the highest number of rainy days is March (8.6 days).
The month with the least rainy days is June (1.9 days).
Average daylight in December /
Average sunshine in December
Rancho Santa Margarita, CA
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 6h and 36min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in December
Rancho Santa Margarita, CA
- Average sunshine days in December: 22.7 days
The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is February (19.8 days).
Average UV index in December
Rancho Santa Margarita, CA
- Average UV index in December: 4
The months with the highest UV index are June, July, August and September (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
Rancho Santa Margarita, CA
- Average cloud cover in December: 25
The months with the most cloud cover are March and December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in December
Rancho Santa Margarita, 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).
