January weather forecast and climate
Mill Valley, CA

Weather in January

January, like December, is another mild winter month in Mill Valley, California, with temperature in the range of an average low of 45.5°F (7.5°C) and an average high of 56.1°F (13.4°C).

Temperature

In January, the average high-temperature is practically the same as in December - a still moderate 56.1°F (13.4°C). The average low-temperature, in Mill Valley, is 45.5°F (7.5°C).

Humidity

In Mill Valley, California, the average relative humidity in January is 74%.

Rainfall

In Mill Valley, in January, during 5.9 rainfall days, 0.59" (15mm) of precipitation is typically accumulated. Throughout the year, in Mill Valley, there are 48 rainfall days, and 3.94" (100mm) of precipitation is accumulated.

Daylight

The average length of the day in January is 9.9h.

Sunshine

In January, the average sunshine is 5.7h.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Mill Valley. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sun damage is advised. 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.
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FAQ

What is the temperature in January in Mill Valley?

In Mill Valley, California, in January, the average high-temperature is 56.1°F (13.4°C), and the average low-temperature is 45.5°F (7.5°C).

What is the average humidity in January in Mill Valley?

The average relative humidity in January in Mill Valley is 74%.

How much does it rain in Mill Valley in January?

In January, in Mill Valley, California, the rain falls for 5.9 days. Throughout January, 0.59" (15mm) of precipitation is accumulated.

What is the average length of the day in January in Mill Valley?

In January, the average length of the day in Mill Valley is 9.9h.

How many hours of sunshine does Mill Valley have in January?

The average sunshine in January in Mill Valley, California, is 5.7h.

What are the months with the lowest UV index in Mill Valley?

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

What is the UV index reading in January in Mill Valley?

In Mill Valley, California, the average daily maximum UV index in January is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.

Average temperature in January
Mill Valley, CA

Average temperature in January - Mill Valley, CA
  • Average high temperature in January: 56.1°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 January: 45.5°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 January
Mill Valley, CA

Average pressure in January - Mill Valley, CA
  • Average pressure in January: 30.13"

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 January
Mill Valley, CA

Average wind speed in January - Mill Valley, CA
  • Average wind speed in January: 6mph

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 January
Mill Valley, CA

Average humidity in January - Mill Valley, CA
  • Average humidity in January: 74%

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 January
Mill Valley, CA

Average rainfall in January - Mill Valley, CA
  • Average rainfall in January: 0.59"

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 January
Mill Valley, CA

Average rainfall days in January - Mill Valley, CA
  • Average rainfall days in January: 5.9 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 January /
Average sunshine in January
Mill Valley, CA

Average daylight in January / Average sunshine in January - Mill Valley, CA
  • Average daylight in January: 9.9h

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 January: 5.7h

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 January
Mill Valley, CA

Average sunshine days in January - Mill Valley, CA
  • Average sunshine days in January: 24.2 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 January
Mill Valley, CA

Average UV index in January - Mill Valley, CA
  • Average UV index in January: 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 January
Mill Valley, CA

Average cloud cover in January - Mill Valley, CA
  • Average cloud cover in January: 36

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 January
Mill Valley, CA

Average visibility in January - Mill Valley, CA
  • Average visibility in January: 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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