Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December proves to be the coldest month, recording an average maximum temperature of 61.9°F (16.6°C) and a minimum temperature of 46.9°F (8.3°C).Humidity
In December, the average relative humidity in Winnetka is 53%.Rainfall
In December, the rain falls for 4.7 days. Throughout December, 1.18" (30mm) of precipitation is accumulated. In Winnetka, during the entire year, the rain falls for 42.7 days and collects up to 6.46" (164mm) of precipitation.Snowfall
December is the only month when snow falls in Winnetka. The month with the most snowfall days is December, when snow falls for 0.1 days.Daylight
The month with the shortest days is December, with an average of 9h and 54min of daylight.On the first day of December in Winnetka, sunrise is at 6:42 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 4:55 pm PST.
Sunshine
The months with the least sunshine in Winnetka are January, February and December, with an average of 6.8h of sunshine.UV index
With an average maximum UV index of 3, December is the month with the lowest UV index in Winnetka. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: In December, an average UV index of 3 transforms into the following instructions:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Frequently asked questions
What are the coldest months in Winnetka?
What is the average December temperature in Winnetka?
What is the average humidity in December in Winnetka?
How much does it rain in Winnetka in December?
What is the snowiest month in Winnetka?
When does it start to snow in Winnetka?
What is the month with the shortest days in Winnetka?
How many hours of daylight does Winnetka have in December?
What time are sunrise and sunset in December in Winnetka?
What are the months with the least sunshine in Winnetka?
How long on average sun shines in December in Winnetka?
When is the lowest UV index in Winnetka?
How high is the UV index in December in Winnetka?
Average temperature in December
Winnetka, CA
- Average high temperature in December: 61.9°F
The warmest month (with the highest average high temperature) is August (85.6°F).
The month with the lowest average high temperature is December (61.9°F).
- Average low temperature in December: 46.9°F
The month with the highest average low temperature is August (64.8°F).
The coldest month (with the lowest average low temperature) is December (46.9°F).
Average pressure in December
Winnetka, CA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Winnetka, CA
- Average wind speed in December: 6.1mph
The windiest months (with the highest average wind speed) are January and December (6.1mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity in December
Winnetka, CA
- Average humidity in December: 53%
The month with the highest relative humidity is June (59%).
The month with the lowest relative humidity is November (47%).
Average rainfall in December
Winnetka, CA
- Average rainfall in December: 1.18"
The wettest month (with the highest rainfall) is February (1.22").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Winnetka, CA
- Average rainfall days in December: 4.7 days
The month with the highest number of rainy days is March (6.5 days).
The month with the least rainy days is June (1.4 days).
Average snowfall days in December
Winnetka, CA
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Winnetka, CA
- Average daylight in December: 9h and 5min
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 5min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 48min).
Average sunshine days in December
Winnetka, CA
- Average sunshine days in December: 24.7 days
The months with the most sunshine days are August and October (27.3 days).
The month with the least sunshine days is February (22 days).
Average UV index in December
Winnetka, CA
- Average UV index in December: 3
The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Winnetka, CA
- Average cloud cover in December: 21
The month with the most cloud cover is March (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility in December
Winnetka, 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).
Winnetka, California, USA
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