December weather forecast
Montalvo, CA

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Weather in December

The first month of the winter, December, is still a mild month in Montalvo, California, with temperature in the range of an average high of 59.5°F (15.3°C) and an average low of 50°F (10°C).

Temperature

The transition into December is accompanied by a slight temperature decrease, with the average high-temperature shifting from a refreshing 64.9°F (18.3°C) in November to a mild 59.5°F (15.3°C). Montalvo's average low-temperature in December is measured at a cool 50°F (10°C).

Humidity

In Montalvo, the average relative humidity in December is 59%.

Rainfall

In Montalvo, in December, it is raining for 5.5 days, with typically 1.14" (29mm) of accumulated precipitation. In Montalvo, during the entire year, the rain falls for 47.8 days and collects up to 6.97" (177mm) of precipitation.

Daylight

December has the shortest days of the year, with an average of 9h and 54min of daylight.
On the first day of the month, sunrise is at 6:45 am and sunset at 4:47 pm. On the last day of December, sunrise is at 7:02 am and sunset at 4:57 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 medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 3 suggests these recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.

Frequently asked questions

What is the temperature in December?

The average high-temperature and low-temperature during December are 59.5°F (15.3°C) and 50°F (10°C) respectively.

What is the average humidity in December?

In Montalvo, the average relative humidity in December is 59%.

How much does it rain in December?

In December, the rain falls for 5.5 days. Throughout December, 1.14" (29mm) of precipitation is accumulated.

What is the month with the shortest days in Montalvo?

With an average of 9h and 54min of daylight, December has the shortest days of the year.

How many hours of daylight does Montalvo have in December?

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

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 6:45 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 4:57 pm PST.

What is the month with the least sunshine in Montalvo?

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

How many hours of sunshine does Montalvo have in December?

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

When is the lowest UV index?

December is the month with the lowest UV index, with an average maximum UV index of 3.

How high is the UV index in December in Montalvo?

In December, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Montalvo, CA

Average temperature in December - Montalvo, CA
  • Average high temperature in December: 59.5°F

The warmest months (with the highest average high temperature) are August and September (74.3°F).
The month with the lowest average high temperature is February (59°F).

  • Average low temperature in December: 50°F

The month with the highest average low temperature is August (62.6°F).
The coldest month (with the lowest average low temperature) is February (48.9°F).

Average pressure in December
Montalvo, CA

Average pressure in December - Montalvo, 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 September (29.9"Hg).

Average wind speed in December
Montalvo, CA

Average wind speed in December - Montalvo, CA
  • Average wind speed in December: 6.5mph

The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest months (with the lowest average wind speed) are August and September (5mph).

Average humidity in December
Montalvo, CA

Average humidity in December - Montalvo, CA
  • Average humidity in December: 59%

The months with the highest relative humidity are June and July (69%).
The month with the lowest relative humidity is November (56%).

Average rainfall in December
Montalvo, CA

Average rainfall in December - Montalvo, CA
  • Average rainfall in December: 1.14"

The wettest month (with the highest rainfall) is January (1.34").
The driest month (with the least rainfall) is June (0.12").

Average rainfall days in December
Montalvo, CA

Average rainfall days in December - Montalvo, CA
  • Average rainfall days in December: 5.5 days

The month with the highest number of rainy days is March (6 days).
The month with the least rainy days is August (2.1 days).

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

Average daylight in December / Average sunshine in December - Montalvo, 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 July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 48min).

Average sunshine days in December
Montalvo, CA

Average sunshine days in December - Montalvo, CA
  • Average sunshine days in December: 24.6 days

The month with the most sunshine days is October (26 days).
The month with the least sunshine days is July (20.4 days).

Average UV index in December
Montalvo, CA

Average UV index in December - Montalvo, CA
  • Average UV index in December: 3

The month with the highest UV index is August (UV index 6).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in December
Montalvo, CA

Average cloud cover in December - Montalvo, 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 5).

Average visibility in December
Montalvo, CA

Average visibility in December - Montalvo, 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).

Montalvo, California, USA

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