January weather forecastSan Ramon, CA
January
Weather in January
January, the same as December, in San Ramon, California, is a moderate winter month, with an average temperature fluctuating between 42.3°F (5.7°C) and 57°F (13.9°C).Temperature
January ushers in an average high-temperature of a still refreshing 57°F (13.9°C), aligning closely with the preceding month. During the month of January, the temperature generally drops to a low average of 42.3°F (5.7°C).Humidity
In January, the average relative humidity is 73%.Rainfall
In San Ramon, in January, during 9.1 rainfall days, 1.89" (48mm) of precipitation is typically accumulated. In San Ramon, during the entire year, the rain falls for 67.2 days and collects up to 10.98" (279mm) of precipitation.Daylight
The average length of the day in January in San Ramon, California, is 9h and 54min.On the first day of January, sunrise is at 7:23 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 5:29 pm PST.
Sunshine
In January, the average sunshine is 6.1h.UV index
The months with the lowest UV index in San Ramon, California, are January, February, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: A typical high UV index of 3 in January suggests the following recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
San Ramon, CA
- Average high temperature in January: 57°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is December (55.9°F).
- Average low temperature in January: 42.3°F
The month with the highest average low temperature is September (56.5°F).
The coldest month (with the lowest average low temperature) is December (42.1°F).
Average pressure in January
San Ramon, CA
- Average pressure in January: 30.14"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in January
San Ramon, CA
- Average wind speed in January: 4.4mph
The windiest month (with the highest average wind speed) is May (6.7mph).
The calmest month (with the lowest average wind speed) is November (4.2mph).
Average humidity in January
San Ramon, CA
- Average humidity in January: 73%
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (57%).
Average rainfall in January
San Ramon, CA
- Average rainfall in January: 1.89"
The wettest month (with the highest rainfall) is February (2.28").
The driest month (with the least rainfall) is July (0").
Average rainfall days in January
San Ramon, CA
- Average rainfall days in January: 9.1 days
The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (0.6 days).
Average daylight in January /
Average sunshine in January
San Ramon, CA
- Average daylight in January: 9h and 54min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January: 6h and 6min
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
San Ramon, CA
- Average sunshine days in January: 21 days
The month with the most sunshine days is July (29.9 days).
The month with the least sunshine days is March (17.5 days).
Average UV index in January
San Ramon, 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
San Ramon, CA
- Average cloud cover in January: 33
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
San Ramon, 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).
