December weather forecast
Twin Peaks, CA

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Weather in December

December, the first month of the winter in Twin Peaks, is still a mild month, with an average temperature varying between 41.5°F (5.3°C) and 57.7°F (14.3°C).

Temperature

December is the coldest month, with an average high-temperature of 57.7°F (14.3°C) and an average low-temperature of 41.5°F (5.3°C).

Humidity

The average relative humidity in December is 51%.

Rainfall

The month with the most rainfall is December, when the rain falls for 6.8 days and typically aggregates up to 1.42" (36mm) of precipitation.

Snowfall

In Twin Peaks, snow does not fall in January, March through December.

Daylight

With an average of 9h and 55min of daylight, December has the shortest days of the year in Twin Peaks.
On the first day of December in Twin Peaks, California, sunrise is at 6:36 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 4:49 pm PST.

Sunshine

With an average of 6.9h of sunshine, December has the least sunshine of the year.

UV index

November and December, with an average maximum UV index of 3, are months with the lowest UV index in Twin Peaks, California. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 3 in December transform into the following instructions:
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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the coldest month in Twin Peaks?

December is the coldest month in Twin Peaks, with an average high-temperature of 57.7°F (14.3°C) and an average low-temperature of 41.5°F (5.3°C).

What is the temperature in December in Twin Peaks?

In December, the average high-temperature is 57.7°F (14.3°C), and the average low-temperature is 41.5°F (5.3°C). in June, the average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, is computed to be 84.2°F (29°C).

What is the average humidity in December in Twin Peaks?

In December, the average relative humidity is 51%.

What is the wettest month in Twin Peaks?

December is the month with the most rainfall. Rain falls for 6.8 days and accumulates 1.42" (36mm) of precipitation.

How many days does it rain in December in Twin Peaks?

In December, in Twin Peaks, the rain falls for 6.8 days. Throughout December, 1.42" (36mm) of precipitation is accumulated.

When it does not snow in Twin Peaks?

In Twin Peaks, snow does not fall in January, March through December.

What is the month with the shortest days in Twin Peaks?

December has the shortest days of the year in Twin Peaks, with an average of 9h and 55min of daylight.

How many hours of daylight does Twin Peaks have in December?

In December, the average day length in Twin Peaks, California, is 9h and 55min.

What time are sunrise and sunset in December in Twin Peaks?

On the first day of December in Twin Peaks, California, sunrise is at 6:36 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 4:49 pm PST.

What is the month with the least sunshine in Twin Peaks?

December has the least sunshine of the year, with an average of 6.9h of sunshine.

How many hours of sunshine does Twin Peaks have in December?

In Twin Peaks, the average sunshine duration in December is 6.9h.

What are the months with the lowest UV index in Twin Peaks?

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

How high is the UV index in December in Twin Peaks?

In December, the average daily maximum UV index in Twin Peaks, California, is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
66.6°F 19.2°C
57.7°F 14.3°C
59.9°F 15.5°C
Average low temperature
47.7°F 8.7°C
41.5°F 5.3°C
42.6°F 5.9°C
Average pressure
30.02" 763mmHg
30.07" 764mmHg
30.1" 765mmHg
Average wind speed
5.4mph 8.7km/h
5.4mph 8.7km/h
5.6mph 9km/h
Average max. wind speed
6mph 9.7km/h
5.9mph 9.5km/h
6mph 9.7km/h
Average wind speed gusts
9.1mph 14.6km/h
9.3mph 15km/h
9.6mph 15.4km/h
Average humidity
43%
51%
48%
Average rainfall
0.67" 17mm
1.42" 36mm
0.87" 22mm
Average rainfall days
3.5
6.8
5.8
Average snowfall days
0
0
0
Average daylight
10h 2min
9h 5min
10h 1min
Average sunshine
7h 2min
6h 5min
7h 1min
Average sunshine days
25.5
22.9
23.8
Average UV index
3
3
4
Average cloud cover
14%
21%
19%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in December
Twin Peaks, CA

Average temperature in December - Twin Peaks, CA
  • Average high temperature in December: 57.7°F

The warmest month (with the highest average high temperature) is August (90.9°F).
The month with the lowest average high temperature is December (57.7°F).

  • Average low temperature in December: 41.5°F

The month with the highest average low temperature is August (66.6°F).
The coldest months (with the lowest average low temperature) are February and December (41.5°F).

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Average pressure in December
Twin Peaks, CA

Average pressure in December - Twin Peaks, CA
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in December
Twin Peaks, CA

Average wind speed in December - Twin Peaks, CA
  • Average wind speed in December: 5.4mph

The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is September (4.8mph).

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Average humidity in December
Twin Peaks, CA

Average humidity in December - Twin Peaks, CA
  • Average humidity in December: 51%

The month with the highest relative humidity is February (52%).
The month with the lowest relative humidity is August (36%).

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Average rainfall in December
Twin Peaks, CA

Average rainfall in December - Twin Peaks, CA
  • Average rainfall in December: 1.42"

The wettest month (with the highest rainfall) is December (1.42").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in December
Twin Peaks, CA

Average rainfall days in December - Twin Peaks, CA
  • Average rainfall days in December: 6.8 days

The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is June (1.3 days).

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Average snowfall days in December
Twin Peaks, CA

Average snowfall days in December - Twin Peaks, CA
  • Average snowfall days in December: 0 days

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in December /
Average sunshine in December
Twin Peaks, CA

Average daylight in December / Average sunshine in December - Twin Peaks, 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 month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).

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Average sunshine days in December
Twin Peaks, CA

Average sunshine days in December - Twin Peaks, CA
  • Average sunshine days in December: 22.9 days

The month with the most sunshine days is June (28.5 days).
The month with the least sunshine days is February (20.9 days).

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Average UV index in December
Twin Peaks, CA

Average UV index in December - Twin Peaks, CA
  • Average UV index in December: 3

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are November and December (UV index 3).

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Average cloud cover in December
Twin Peaks, CA

Average cloud cover in December - Twin Peaks, CA
  • Average cloud cover in December: 21

The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in December
Twin Peaks, CA

Average visibility in December - Twin Peaks, 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).

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