January weather forecast and climate
Santa Rosa, CA

Set in a scenic valley, the Camarillo region of Santa Rosa, California, has great modern homes and is neared by scenic rugged mountain layouts
Set in a scenic valley, the Camarillo region of Santa Rosa, California, has great modern homes and is neared by scenic rugged mountain layouts

Weather in January

January, like December, is a moderate winter month in Santa Rosa, California, with temperature in the range of an average low of 43.2°F (6.2°C) and an average high of 57.2°F (14°C).

Temperature

In January, the average high-temperature is essentially the same as in December - a still mild 57.2°F (14°C). In Santa Rosa, California, in January, the average low-temperature is 43.2°F (6.2°C).

Humidity

The average relative humidity in January is 75%.

Rainfall

In Santa Rosa, California, during January, the rain falls for 10 days and regularly aggregates up to 2.01" (51mm) of precipitation. Throughout the year, in Santa Rosa, California, there are 72.8 rainfall days, and 12.01" (305mm) of precipitation is accumulated.

Daylight

In January, the average length of the day is 9.9h.

Sunshine

In Santa Rosa, the average sunshine is 5.8h.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Santa Rosa. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
[Resources]

FAQ

What is the temperature in January in Santa Rosa?

In January, in Santa Rosa, California, the average high-temperature is 57.2°F (14°C), and the average low-temperature is 43.2°F (6.2°C).

What is the average humidity in January in Santa Rosa?

The average relative humidity in January in Santa Rosa is 75%.

How many days does it rain in January in Santa Rosa?

In Santa Rosa, California, during January, the rain falls for 10 days and regularly aggregates up to 2.01" (51mm) of precipitation.

What is the average length of the day in January in Santa Rosa?

The average length of the day in January in Santa Rosa, California, is 9.9h.

How many hours of sunshine does Santa Rosa have in January?

In January, the average sunshine is 5.8h.

What is the month with the lowest UV index in Santa Rosa?

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Santa Rosa.

How high is the UV index in January in Santa Rosa?

The average daily maximum UV index in January in Santa Rosa is 3. A UV Index of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV rays.

Average temperature in January
Santa Rosa, CA

Average temperature in January - Santa Rosa, CA
  • Average high temperature in January: 57.2°F

The warmest month (with the highest average high temperature) is August (79.7°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in January: 43.2°F

Months with the highest average low temperature are August and September (54.7°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).

[Resources]

Average pressure in January
Santa Rosa, CA

Average pressure in January - Santa Rosa, CA
  • Average pressure in January: 30.13"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

[Resources]

Average wind speed in January
Santa Rosa, CA

Average wind speed in January - Santa Rosa, CA
  • Average wind speed in January: 5.2mph

The windiest month (with the highest average wind speed) is May (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.9mph).

[Resources]

Average humidity in January
Santa Rosa, CA

Average humidity in January - 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 (63%).

[Resources]

Average rainfall in January
Santa Rosa, CA

Average rainfall in January - Santa Rosa, CA
  • Average rainfall in January: 2.01"

The wettest month (with the highest rainfall) is February (2.64").
The driest months (with the least rainfall) are July and August (0.04").

[Resources]

Average rainfall days in January
Santa Rosa, CA

Average rainfall days in January - Santa Rosa, CA
  • Average rainfall days in January: 10 days

The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (0.8 days).

[Resources]

Average daylight in January /
Average sunshine in January
Santa Rosa, CA

Average daylight in January / Average sunshine in January - Santa Rosa, CA
  • Average daylight in January: 9.9h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in January: 5.8h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 5.7h).

[Resources]

Average sunshine days in January
Santa Rosa, CA

Average sunshine days in January - Santa Rosa, CA
  • Average sunshine days in January: 19.9 days

The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is March (17.1 days).

[Resources]

Average UV index in January
Santa Rosa, CA

Average UV index in January - Santa Rosa, CA
  • Average UV index in January: 3

The month with the highest UV index is June (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

[Resources]

Average cloud cover in January
Santa Rosa, CA

Average cloud cover in January - Santa Rosa, 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 July (Cloud cover 9).

[Resources]

Average visibility in January
Santa Rosa, CA

Average visibility in January - Santa Rosa, CA
  • Average visibility in January: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

[Resources]