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
The shift into January uncovers an average high-temperature of a still refreshing 56.3°F (13.5°C), subtly different from the previous month. January in Clayton generally records an average low-temperature of 41.7°F (5.4°C).Humidity
The months with the highest humidity are January and March, with an average relative humidity of 73%.Rainfall
In Clayton, in January, during 7.2 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. Throughout the year, in Clayton, California, there are 50 rainfall days, and 4.76" (121mm) of precipitation is accumulated.Daylight
In January, the average length of the day is 9h and 53min.On the first day of January in Clayton, sunrise is at 7:23 am and sunset at 4:58 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 5:29 pm PST.
Sunshine
The average sunshine in January is 6h.UV index
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Clayton. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: In January, a regular UV index of 3 translates into these guidelines:
Be vigilant - A duty to shield skin and eyes from injury exists. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Clayton in January?
What is the most humid month in Clayton?
What is the average humidity in January in Clayton?
How much does it rain in Clayton in January?
What is the average length of the day in January in Clayton?
When is the sunrise / sunset in January in Clayton?
How many hours of sunshine does Clayton have in January?
When is the lowest UV index in Clayton?
What is the UV index reading in January in Clayton?
Average temperature in January
Clayton, CA
- Average high temperature in January: 56.3°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in January: 41.7°F
The month with the highest average low temperature is September (57.6°F).
The coldest month (with the lowest average low temperature) is January (41.7°F).
Average pressure in January
Clayton, CA
- Average pressure in January: 30.14"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in January
Clayton, CA
- Average wind speed in January: 4.5mph
The windiest month (with the highest average wind speed) is May (7.4mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).
Average humidity in January
Clayton, CA
- Average humidity in January: 73%
The months with the highest relative humidity are January and March (73%).
The months with the lowest relative humidity are September and October (55%).
Average rainfall in January
Clayton, CA
- Average rainfall in January: 0.83"
The wettest month (with the highest rainfall) is February (0.98").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in January
Clayton, CA
- Average rainfall days in January: 7.2 days
The month with the highest number of rainy days is March (8.6 days).
The month with the least rainy days is August (0.8 days).
Average daylight in January /
Average sunshine in January
Clayton, 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: 6h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in January
Clayton, CA
- Average sunshine days in January: 22.8 days
The month with the most sunshine days is August (29.4 days).
The month with the least sunshine days is March (21.7 days).
Average UV index in January
Clayton, CA
- Average UV index in January: 3
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in January
Clayton, CA
- Average cloud cover in January: 34
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility in January
Clayton, 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).
Clayton, California, USA
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