Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
Transitioning from December to January, Mill Valley observes an average high-temperature of a still refreshing 56.1°F (13.4°C), differing subtly from the previous month. An average nighttime temperature of 45.5°F (7.5°C) is witnessed throughout January.Humidity
In January, the average relative humidity is 74%.Rainfall
In Mill Valley, in January, during 5.9 rainfall days, 0.59" (15mm) of precipitation is typically accumulated. Throughout the year, there are 48 rainfall days, and 3.94" (100mm) of precipitation is accumulated.Daylight
In January, the average length of the day is 9h and 53min.On the first day of the month, sunrise is at 7:25 am and sunset at 5:01 pm. On the last day of January, sunrise is at 7:15 am and sunset at 5:31 pm PST.
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. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A typical high UV index of 3 in January suggests the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average January temperature?
What is the average humidity in January?
How many days does it rain in January?
How many hours of daylight does Mill Valley have in January?
When is the sunrise / sunset in January?
How many hours of sunshine does Mill Valley have in January?
What are the months with the lowest UV index?
What is the UV index intensity in January?
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).
Average pressure in January
Mill Valley, CA
- Average pressure in January: 30.13"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
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).
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%).
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").
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).
The months with the least rainy days are June and August (1.2 days).
Average daylight in January /
Average sunshine in January
Mill Valley, CA
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January: 5h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
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).
Average UV index in January
Mill Valley, CA
- Average UV index in January: 3
The months with the highest UV index are April, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
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).
Average visibility in January
Mill Valley, CA
- Average visibility in January: 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).
Mill Valley, California, USA
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