January weather forecastOakley, CA
January
Weather in January
January in Oakley, California, is a moderate winter month, with an average temperature fluctuating between 56.1°F (13.4°C) and 41.5°F (5.3°C).Temperature
The arrival of January sees an average high-temperature of a mild 56.1°F (13.4°C), hardly diverging from December's 55°F (12.8°C). The average temperature in Oakley drops to a cold 41.5°F (5.3°C) during the night in the month of January.Humidity
With an average relative humidity of 74%, January is the most humid month.Rainfall
In Oakley, during January, the rain falls for 8.6 days and regularly aggregates up to 1.89" (48mm) of precipitation. Throughout the year, in Oakley, there are 62 rainfall days, and 10.16" (258mm) of precipitation is accumulated.Snowfall
January through November are months without snowfall in Oakley.Daylight
The average length of the day in January is 9h and 53min.On the first day of the month, sunrise is at 7:22 am and sunset at 4:57 pm. On the last day of January, sunrise is at 7:12 am and sunset at 5:28 pm PST.
Sunshine
In Oakley, the average sunshine in January is 6h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 3 in January translates into these instructions:
Exercise prevention - Precautions against solar damage are endorsed. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. 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
Average temperature in January
Oakley, CA
- Average high temperature in January: 56.1°F
The warmest month (with the highest average high temperature) is July (88.5°F).
The month with the lowest average high temperature is December (55°F).
- Average low temperature in January: 41.5°F
The month with the highest average low temperature is September (57.7°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).
Average pressure in January
Oakley, 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
Oakley, CA
- Average wind speed in January: 4.5mph
The windiest month (with the highest average wind speed) is June (7.8mph).
The calmest months (with the lowest average wind speed) are January and November (4.5mph).
Average humidity in January
Oakley, CA
- Average humidity in January: 74%
The month with the highest relative humidity is January (74%).
The month with the lowest relative humidity is September (52%).
Average rainfall in January
Oakley, CA
- Average rainfall in January: 1.89"
The wettest month (with the highest rainfall) is February (2.09").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in January
Oakley, CA
- Average rainfall days in January: 8.6 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (0.8 days).
Average snowfall days in January
Oakley, CA
- Average snowfall days in January: 0 days
The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in January /
Average sunshine in January
Oakley, CA
- Average daylight in January: 9h and 54min
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
Oakley, CA
- Average sunshine days in January: 21.8 days
The month with the most sunshine days is August (29.8 days).
The month with the least sunshine days is March (17.7 days).
Average UV index in January
Oakley, 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
Oakley, CA
- Average cloud cover in January: 34
The months with the most cloud cover are March and December (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 5).
Average visibility in January
Oakley, 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).
