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
December
Weather in December
Temperature
Winnetka's coldest temperatures are experienced in December, with average high temperatures of 61.9°F (16.6°C) and lows of 46.9°F (8.3°C).Humidity
The average relative humidity in December is 53%.Rainfall
In Winnetka, in December, during 4.7 rainfall days, 1.18" (30mm) of precipitation is typically 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. The month with the most snowfall days is December, when snow falls for 0.1 days.Daylight
December has the shortest days of the year, with an average of 9h and 54min of daylight.On the first day of December, 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
January, February and December, with an average of 6.8h of sunshine, are months with the least sunshine.UV index
The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum daily UV index of 3 during December morphs into the following directions:
Heed the precautions - Suggestions to avoid sunburn are made. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest in Winnetka?
What is the temperature in December?
What is the average humidity in December?
How much does it rain in December?
What is the snowiest month?
When does it start snowing?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
What is the month with the least sunshine?
How long on average sun shines in December?
When is the lowest UV index?
How high is the UV index in December?
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).