December weather forecast
Winnetka, CA

Share

Weather in December

December, the first month of the winter in Winnetka, is still a comfortable month, with an average temperature ranging between max 61.9°F and min 46.9°F.

Temperature

In Winnetka, the month of December registers the lowest temperatures, averaging 61.9°F at the peak and 46.9°F at the lowest.

Humidity

In December, the average relative humidity in Winnetka is 53%.

Rainfall

In Winnetka, in December, during 4.7 rainfall days, 1.18" of precipitation is typically accumulated. Throughout the year, there are 42.7 rainfall days, and 6.46" of precipitation is accumulated.

Snowfall

The only month with snowfall in Winnetka is December. December has the most snowfall days of the year in Winnetka, California. Snow falls for 0.1 days.

Daylight

December has the shortest days of the year in Winnetka, with an average of 9h and 54min of daylight.
On the first day of the month, sunrise is at 6:42 am and sunset at 4:44 pm. On the last day of December, sunrise is at 6:59 am and sunset at 4:54 pm PST.

Sunshine

January, February and December, with an average of 6.8h of sunshine, are months with the least sunshine.

UV index

December is the month with the lowest UV index in Winnetka, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.
Note: In December, a daily UV index of 3 turns into the following recommendations:
Undertake protective steps - Recommendations to avoid sunburn are issued. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
[Resources]

FAQ

What time of the year is the coldest in Winnetka?

The month of December sees the average lowest temperatures in Winnetka, reaching 61.9°F at the peak and 46.9°F at the low.

What is the average December temperature in Winnetka?

The average high-temperature, in December, in Winnetka, is 61.9°F, while the average low-temperature is 46.9°F. The average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in September is computed to be 84.2°F.

What is the average humidity in December in Winnetka?

The average relative humidity in December is 53%.

How much does it rain in Winnetka in December?

In Winnetka, in December, during 4.7 rainfall days, 1.18" of precipitation is typically accumulated.

What is the snowiest month in Winnetka?

December has the most snowfall days of the year in Winnetka. Snow falls for 0.1 days.

When does it start to snow in Winnetka?

December is the first month it typically snows in Winnetka, California. Throughout December, there are 0.1 snowfall days.

What is the month with the shortest days in Winnetka?

December has the shortest days of the year in Winnetka, California, with an average of 9h and 54min of daylight.

What is the average length of the day in December in Winnetka?

In December, the average day length is 9h and 55min.

When are sunrise and sunset in December in Winnetka?

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 6:59 am and sunset at 4:54 pm PST.

What is the month with the least sunshine in Winnetka?

January, February and December, with an average of 6.8h of sunshine, are months with the least sunshine in Winnetka.

How long on average sun shines in December in Winnetka?

In Winnetka, California, the average sunshine duration in December is 6.8h.

What is the month with the lowest UV index in Winnetka?

With an average maximum UV index of 3, December is the month with the lowest UV index in Winnetka, California.

What is the UV index intensity in December in Winnetka?

In Winnetka, the average daily maximum UV index in December is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Winnetka, CA

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).

[Resources]

Average pressure in December
Winnetka, CA

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).

[Resources]

Average wind speed in December
Winnetka, CA

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).

[Resources]

Average humidity in December
Winnetka, CA

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%).

[Resources]

Average rainfall in December
Winnetka, CA

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").

[Resources]

Average rainfall days in December
Winnetka, CA

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).

[Resources]

Average snowfall days in December
Winnetka, CA

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).

[Resources]

Average daylight in December /
Average sunshine in December
Winnetka, CA

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).

[Resources]

Average sunshine days in December
Winnetka, CA

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).

[Resources]

Average UV index in December
Winnetka, CA

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).

[Resources]

Average cloud cover in December
Winnetka, CA

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).

[Resources]

Average visibility in December
Winnetka, CA

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).

[Resources]

Winnetka, California, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location