December weather forecast and climate
Upper Lake, CA

Weather in December

December, the first month of the winter, in Upper Lake, is also a fresh month, with average temperature varying between 37.2°F (2.9°C) and 52.3°F (11.3°C).

Temperature

December is the coldest month, with an average high-temperature of 52.3°F (11.3°C) and an average low-temperature of 37.2°F (2.9°C).

Humidity

In December, the average relative humidity is 73%.

Rainfall

In Upper Lake, in December, it is raining for 12.3 days, with typically 3.7" (94mm) of accumulated precipitation. In Upper Lake, during the entire year, the rain falls for 92 days and collects up to 21.02" (534mm) of precipitation.

Snowfall

Months with snowfall are January through March, November and December. In Upper Lake, in December, during 0.2 snowfall days, 0.08" (2mm) of snow is typically accumulated. In Upper Lake, during the entire year, snow falls for 2 days, and aggregates up to 1.34" (34mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9.5h of daylight.

Sunshine

December has the least sunshine of the year in Upper Lake, with an average of 5.3h of sunshine.

UV index

Months with the lowest UV index in Upper Lake are January, February, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Upper Lake?

With an average high-temperature of 52.3°F (11.3°C) and an average low-temperature of 37.2°F (2.9°C), December is the coldest month.

What is the temperature in December in Upper Lake?

In Upper Lake, California, in December, the average high-temperature is 52.3°F (11.3°C), and the average low-temperature is 37.2°F (2.9°C).

What is the average humidity in December in Upper Lake?

In December, the average relative humidity is 73%.

How many days does it rain in December in Upper Lake?

In December, in Upper Lake, the rain falls for 12.3 days. Throughout December, 3.7" (94mm) of precipitation is accumulated.

How much does it snow in Upper Lake in December?

In Upper Lake, California, in December, during 0.2 snowfall days, 0.08" (2mm) of snow is typically accumulated.

What is the month with the shortest days in Upper Lake?

December has the shortest days of the year in Upper Lake, with an average of 9.5h of daylight.

What is the average length of the day in December in Upper Lake?

The average length of the day in December in Upper Lake, California, is 9.5h.

What is the month with the least sunshine in Upper Lake?

With an average of 5.3h of sunshine, December has the least sunshine of the year in Upper Lake.

How many hours of sunshine does Upper Lake have in December?

The average sunshine in December in Upper Lake, California, is 5.3h.

When is the lowest UV index in Upper Lake?

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.

What is the UV index reading in December in Upper Lake?

The average daily maximum UV index in December in Upper Lake is 3. A UV Index value of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in December
Upper Lake, CA

Average temperature in December - Upper Lake, CA
  • Average high temperature in December: 52.3°F

The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is December (52.3°F).

  • Average low temperature in December: 37.2°F

The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).

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Average pressure in December
Upper Lake, CA

Average pressure in December - Upper Lake, CA
  • Average pressure in December: 30.11"

The month with the highest atmospheric pressure is January (30.14").
Months with the lowest atmospheric pressure are June and August (29.91").

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Average wind speed in December
Upper Lake, CA

Average wind speed in December - Upper Lake, CA
  • Average wind speed in December: 4.4mph

The windiest month (with the highest average wind speed) is April (5.3mph).
The calmest month (with the lowest average wind speed) is November (4.1mph).

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Average humidity in December
Upper Lake, CA

Average humidity in December - Upper Lake, CA
  • Average humidity in December: 73%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (47%).

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Average rainfall in December
Upper Lake, CA

Average rainfall in December - Upper Lake, CA
  • Average rainfall in December: 3.7"

The wettest month (with the highest rainfall) is February (4.06").
The driest month (with the least rainfall) is July (0.04").

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Average rainfall days in December
Upper Lake, CA

Average rainfall days in December - Upper Lake, CA
  • Average rainfall days in December: 12.3 days

The month with the highest number of rainy days is March (15.9 days).
Months with the least rainy days are July and August (1.3 days).

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Average snowfall in December
Upper Lake, CA

Average snowfall in December - Upper Lake, CA
  • Average snowfall in December: 0.08"

Months with the highest snowfall are January and February (0.47").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Upper Lake, CA

Average snowfall days in December - Upper Lake, CA
  • Average snowfall days in December: 0.2 days

The month with the highest number of snowfall days is February (0.9 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Upper Lake, CA

Average daylight in December / Average sunshine in December - Upper Lake, CA
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 5.3h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.3h).

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Average sunshine days in December
Upper Lake, CA

Average sunshine days in December - Upper Lake, CA
  • Average sunshine days in December: 17.6 days

Months with the most sunshine days are July and August (28.3 days).
The month with the least sunshine days is March (13.7 days).

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Average UV index in December
Upper Lake, CA

Average UV index in December - Upper Lake, CA
  • Average UV index in December: 3

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Upper Lake, CA

Average cloud cover in December - Upper Lake, CA
  • Average cloud cover in December: 42

The month with the most cloud cover is March (Cloud cover 44).
Months with the least cloud cover are July and August (Cloud cover 5).

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Average visibility in December
Upper Lake, CA

Average visibility in December - Upper Lake, CA
  • Average visibility in December: 5mi

Months with the highest visibility are January, February, April, May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are March and December (5mi).

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