January weather forecast
Riverdale, CA

Weather in January

January, like December, is a moderate winter month in Riverdale, California, with an average temperature varying between 59.4°F (15.2°C) and 44.2°F (6.8°C).

Temperature

In January, the average high-temperature is essentially the same as in December - a still mild 59.4°F (15.2°C). The average low-temperature, in January, is 44.2°F (6.8°C).

Humidity

January and December, with an average relative humidity of 66%, are the most humid months.

Rainfall

The wettest months are January through March, with an average 1.54" (39mm) of rainfall.

Daylight

In January, the average length of the day in Riverdale is 10h and 1min.
On the first day of January in Riverdale, California, sunrise is at 7:11 am and sunset at 4:55 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 5:24 pm PST.

Sunshine

The average sunshine in January is 6.7h.

UV index

The months with the lowest UV index are January, 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 rays for the ordinary person.
Note: The daily maximum UV index of 3 in January interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the most humid month in Riverdale?

The months with the highest humidity in Riverdale are January and December, with an average relative humidity of 66%.

What is the average humidity in January in Riverdale?

The average relative humidity in January in Riverdale is 66%.

What is the rainiest month in Riverdale?

The wettest months in Riverdale, California, are January through March, with an average 1.54" (39mm) of rainfall.

How much does it rain in Riverdale in January?

In Riverdale, California, during January, the rain falls for 7.3 days and regularly aggregates up to 1.54" (39mm) of precipitation.

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

The average day length in January in Riverdale, California, is 10h and 1min.

What time are sunrise and sunset in January in Riverdale?

In January, on the first day of the month, sunrise is at 7:11 am and sunset at 4:55 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 5:24 pm PST.

How many hours of sunshine does Riverdale have in January?

In January, the average sunshine duration is 6.7h.

When is the lowest UV index in Riverdale?

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

What is the UV index reading in January in Riverdale?

In Riverdale, California, the average daily maximum UV index in January is 3. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.

Average temperature in January
Riverdale, CA

Average temperature in January - Riverdale, CA
  • Average high temperature in January: 59.4°F

The warmest month (with the highest average high temperature) is July (102.2°F).
The month with the lowest average high temperature is December (57.2°F).

  • Average low temperature in January: 44.2°F

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is December (43°F).

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Average pressure in January
Riverdale, CA

Average pressure in January - Riverdale, 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 (29.89"Hg).

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Average wind speed in January
Riverdale, CA

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

The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest months (with the lowest average wind speed) are January and November (4.8mph).

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Average humidity in January
Riverdale, CA

Average humidity in January - Riverdale, CA
  • Average humidity in January: 66%

The months with the highest relative humidity are January and December (66%).
The month with the lowest relative humidity is July (30%).

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Average rainfall in January
Riverdale, CA

Average rainfall in January - Riverdale, CA
  • Average rainfall in January: 1.54"

The wettest months (with the highest rainfall) are January, February and March (1.54").
The driest month (with the least rainfall) is August (0.08").

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Average rainfall days in January
Riverdale, CA

Average rainfall days in January - Riverdale, CA
  • Average rainfall days in January: 7.3 days

The month with the highest number of rainy days is March (9.6 days).
The month with the least rainy days is August (0.8 days).

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

Average daylight in January / Average sunshine in January - Riverdale, CA
  • Average daylight in January: 10h and 1min

The month with the longest days is June (Average daylight: 14h and 37min).
The month with the shortest days is December (Average daylight: 9h and 43min).

  • Average sunshine in January: 6.7h

The months with the most sunshine are June and July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.4h).

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Average sunshine days in January
Riverdale, CA

Average sunshine days in January - Riverdale, CA
  • Average sunshine days in January: 22.8 days

The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is February (19.4 days).

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Average UV index in January
Riverdale, CA

Average UV index in January - Riverdale, CA
  • Average UV index in January: 3

The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 3).

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Average cloud cover in January
Riverdale, CA

Average cloud cover in January - Riverdale, CA
  • Average cloud cover in January: 27

The months with the most cloud cover are March and December (Cloud cover 28).
The month with the least cloud cover is August (Cloud cover 4).

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Average visibility in January
Riverdale, CA

Average visibility in January - Riverdale, 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).

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