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 introduction of January sees an average high-temperature of a still mild 57°F (13.9°C), hardly deviating from December. An average low-temperature of 43.2°F (6.2°C) is noted during the nights in January.Humidity
The average relative humidity in January is 75%.Rainfall
In South Santa Rosa, in January, it is raining for 5.6 days, with typically 0.51" (13mm) of accumulated precipitation. Throughout the year, there are 44.3 rainfall days, and 3.78" (96mm) of precipitation is accumulated.Daylight
In January, the average length of the day is 9h and 51min.On the first day of January, sunrise is at 7:27 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 5:31 pm PST.
Sunshine
The average sunshine in January is 5.8h.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 of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: In January, a daily maximum UV index of 3 leads to the following instructions:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. To protect against the Sun's most potent rays, avoid direct exposure around midday. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for South Santa Rosa in January?
What is the average humidity in January?
How much does it rain in January?
What is the average length of the day in January?
When are sunrise and sunset in January in South Santa Rosa?
How long on average sun shines in January?
When is the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
South Santa Rosa, CA
- Average high temperature in January: 57°F
The warmest months (with the highest average high temperature) are July and August (79.9°F).
The month with the lowest average high temperature is December (55.6°F).
- Average low temperature in January: 43.2°F
The months with the highest average low temperature are August and September (55°F).
The coldest month (with the lowest average low temperature) is December (42.4°F).
Average pressure in January
South Santa Rosa, 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
South Santa Rosa, CA
- Average wind speed in January: 5.1mph
The windiest month (with the highest average wind speed) is May (6.8mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).
Average humidity in January
South Santa Rosa, CA
- Average humidity in January: 75%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (62%).
Average rainfall in January
South Santa Rosa, CA
- Average rainfall in January: 0.51"
The wettest month (with the highest rainfall) is February (0.91").
The driest months (with the least rainfall) are June, July, August and September (0.04").
Average rainfall days in January
South Santa Rosa, CA
- Average rainfall days in January: 5.6 days
The month with the highest number of rainy days is March (8.7 days).
The month with the least rainy days is August (0.5 days).
Average daylight in January /
Average sunshine in January
South Santa Rosa, 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 30min).
- Average sunshine in January: 5h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in January
South Santa Rosa, CA
- Average sunshine days in January: 23.8 days
The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is March (20.8 days).
Average UV index in January
South Santa Rosa, CA
- Average UV index in January: 3
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in January
South Santa Rosa, CA
- Average cloud cover in January: 36
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in January
South Santa Rosa, 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).
South Santa Rosa, California, USA
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