January weather forecast
Castella, CA

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Weather in January

January is a frosty winter month in Castella, California, with an average temperature varying between 43.3°F (6.3°C) and 28.8°F (-1.8°C).

Temperature

Castella's average high-temperature in January is a chilly 43.3°F (6.3°C), indicating a subtle variation from December. The average temperature in Castella during January nights dips to a freezing cold 28.8°F (-1.8°C).

Humidity

In January, the average relative humidity is 80%.

Rainfall

In January, the rain falls for 12.3 days. Throughout January, 5.28" (134mm) of precipitation is accumulated. In Castella, during the entire year, the rain falls for 113.4 days and collects up to 31.3" (795mm) of precipitation.

Snowfall

Months with snowfall in Castella are January through May, October through December. January is the month with the most snowfall in Castella. Snow falls for 5.8 days and accumulates 12.6" (320mm) of snow.

Daylight

The average length of the day in January in Castella is 9h and 37min.
On the first day of the month, sunrise is at 7:34 am and sunset at 4:51 pm. On the last day of January, in Castella, sunrise is at 7:21 am and sunset at 5:24 pm PST.

Sunshine

In January, the average sunshine is 5.4h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Castella, California. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 2 in January translates into the following recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. When the Sun is at its strongest around midday, find shade and limit exposure. Enhance your sun protection with tightly woven, yet airy clothing. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Resources | Updated: Feb 9, 2024 | Published by: Weather U.S.

Frequently asked questions

How cold does it get in Castella in January?

In Castella, in January, the average high-temperature is 43.3°F (6.3°C), and the average low-temperature is 28.8°F (-1.8°C).

What is the average humidity in January in Castella?

In January, the average relative humidity in Castella is 80%.

How many days does it rain in January in Castella?

In Castella, during January, the rain falls for 12.3 days and regularly aggregates up to 5.28" (134mm) of precipitation.

When does it snow the most in Castella?

January is the month with the most snowfall. Snow falls for 5.8 days and accumulates 12.6" (320mm) of snow.

How many days does it snow in January in Castella?

In Castella, California, in January, during 5.8 snowfall days, 12.6" (320mm) of snow is typically accumulated.

What is the average length of the day in January in Castella?

In Castella, California, the average day length in January is 9h and 37min.

When is the sunrise / sunset in January in Castella?

In January, on the first day of the month, sunrise is at 7:34 am and sunset at 4:51 pm. On the last day of the month, in Castella, sunrise is at 7:21 am and sunset at 5:24 pm PST.

How long on average sun shines in January in Castella?

In January, the average sunshine duration in Castella is 5.4h.

When is the lowest UV index in Castella?

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.

What is the UV index reading in January in Castella?

In Castella, California, the average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a low health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Castella, CA

Average temperature in January - Castella, CA
  • Average high temperature in January: 43.3°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 (41°F).

  • Average low temperature in January: 28.8°F

The months with the highest average low temperature are July and August (51.4°F).
The coldest month (with the lowest average low temperature) is December (26.8°F).

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Average pressure in January
Castella, CA

Average pressure in January - Castella, CA
  • Average pressure in January: 30.17"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).

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Average wind speed in January
Castella, CA

Average wind speed in January - Castella, CA
  • Average wind speed in January: 4.8mph

The windiest month (with the highest average wind speed) is March (5.7mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).

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Average humidity in January
Castella, CA

Average humidity in January - Castella, CA
  • Average humidity in January: 80%

The month with the highest relative humidity is March (81%).
The month with the lowest relative humidity is August (44%).

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Average rainfall in January
Castella, CA

Average rainfall in January - Castella, CA
  • Average rainfall in January: 5.28"

The wettest month (with the highest rainfall) is March (5.55").
The driest month (with the least rainfall) is July (0.24").

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Average rainfall days in January
Castella, CA

Average rainfall days in January - Castella, CA
  • Average rainfall days in January: 12.3 days

The month with the highest number of rainy days is March (17.3 days).
The month with the least rainy days is August (2.7 days).

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Average snowfall in January
Castella, CA

Average snowfall in January - Castella, CA
  • Average snowfall in January: 12.6"

The month with the highest snowfall is January (12.6").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Castella, CA

Average snowfall days in January - Castella, CA
  • Average snowfall days in January: 5.8 days

The month with the highest number of snowfall days is December (6.4 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in January /
Average sunshine in January
Castella, CA

Average daylight in January / Average sunshine in January - Castella, CA
  • Average daylight in January: 9h and 4min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in January: 5h and 2min

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 12min).

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Average sunshine days in January
Castella, CA

Average sunshine days in January - Castella, CA
  • Average sunshine days in January: 14.8 days

The month with the most sunshine days is August (25.7 days).
The month with the least sunshine days is March (11.1 days).

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Average UV index in January
Castella, CA

Average UV index in January - Castella, CA
  • Average UV index in January: 2

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in January
Castella, CA

Average cloud cover in January - Castella, CA
  • Average cloud cover in January: 42

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 6).

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Average visibility in January
Castella, CA

Average visibility in January - Castella, CA
  • Average visibility in January: 5mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).

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Castella, California, USA

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