December weather forecast and climate
Ross, CA

Weather in December

The first month of the winter, December, is also a moderate month in Ross, California, with temperature in the range of an average high of 55.4°F (13°C) and an average low of 45.3°F (7.4°C).

Temperature

The coldest month is December, with an average high-temperature of 55.4°F (13°C) and an average low-temperature of 45.3°F (7.4°C).

Humidity

The average relative humidity in Ross is 73%.

Rainfall

In Ross, it is raining for 7.2 days, with typically 0.67" (17mm) of accumulated precipitation. Throughout the year, in Ross, there are 48 rainfall days, and 3.94" (100mm) of precipitation is accumulated.

Daylight

December has the shortest days of the year, with an average of 9.6h of daylight.

Sunshine

The month with the least sunshine is December, with an average of 5.5h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Ross. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What is the coldest month in Ross?

With an average high-temperature of 55.4°F (13°C) and an average low-temperature of 45.3°F (7.4°C), December is the coldest month in Ross, California.

What is the temperature in December in Ross?

In Ross, California, in December, the average high-temperature is 55.4°F (13°C), and the average low-temperature is 45.3°F (7.4°C).

What is the average humidity in December in Ross?

The average relative humidity in December in Ross, California, is 73%.

How much does it rain in Ross in December?

In Ross, during December, the rain falls for 7.2 days and regularly aggregates up to 0.67" (17mm) of precipitation.

What is the month with the shortest days in Ross?

With an average of 9.6h of daylight, December has the shortest days of the year.

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

The average length of the day in December is 9.6h.

What is the month with the least sunshine in Ross?

December has the least sunshine of the year, with an average of 5.5h of sunshine.

How long on average sun shines in December in Ross?

The average sunshine in December is 5.5h.

When is the lowest UV index in Ross?

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

How high is the UV index in December in Ross?

The average daily maximum UV index in December in Ross, California, is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in December
Ross, CA

Average temperature in December - Ross, CA
  • Average high temperature in December: 55.4°F

The warmest month (with the highest average high temperature) is September (72.3°F).
The month with the lowest average high temperature is December (55.4°F).

  • Average low temperature in December: 45.3°F

The month with the highest average low temperature is September (56.1°F).
The coldest month (with the lowest average low temperature) is December (45.3°F).

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Average pressure in December
Ross, CA

Average pressure in December - Ross, CA
  • Average pressure in December: 30.1"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed in December
Ross, CA

Average wind speed in December - Ross, CA
  • Average wind speed in December: 6.2mph

The windiest month (with the highest average wind speed) is May (7.8mph).
The calmest months (with the lowest average wind speed) are October and November (5.5mph).

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Average humidity in December
Ross, CA

Average humidity in December - Ross, CA
  • Average humidity in December: 73%

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is October (68%).

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Average rainfall in December
Ross, CA

Average rainfall in December - Ross, CA
  • Average rainfall in December: 0.67"

The wettest month (with the highest rainfall) is February (0.87").
The driest months (with the least rainfall) are June, July, August and September (0.04").

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Average rainfall days in December
Ross, CA

Average rainfall days in December - Ross, CA
  • Average rainfall days in December: 7.2 days

The month with the highest number of rainy days is March (8.8 days).
Months with the least rainy days are June and August (1.2 days).

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

Average daylight in December / Average sunshine in December - Ross, CA
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 5.5h

The month with the most sunshine is July (Average sunshine: 11.2h).
The month with the least sunshine is December (Average sunshine: 5.5h).

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Average sunshine days in December
Ross, CA

Average sunshine days in December - Ross, CA
  • Average sunshine days in December: 22.1 days

The month with the most sunshine days is June (26.4 days).
The month with the least sunshine days is March (20.7 days).

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Average UV index in December
Ross, CA

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

Months with the highest UV index are April, June, July, August and September (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Ross, CA

Average cloud cover in December - Ross, CA
  • Average cloud cover in December: 38

The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is September (Cloud cover 19).

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Average visibility in December
Ross, CA

Average visibility in December - Ross, CA
  • Average visibility in December: 6mi

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

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