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 shift to January signals an average high-temperature of a still refreshing 59.4°F (15.2°C), subtly varied from December's 57.2°F (14°C). Throughout January, Riverdale witnesses a consistent average low-temperature of 44.2°F (6.8°C).Humidity
The months with the highest humidity are January and December, with an average relative humidity of 66%.Rainfall
The wettest months in Riverdale are January through March, with an average 1.54" (39mm) of rainfall.Daylight
The average length of the day in January is 10h and 1min.On the first day of the month, sunrise is at 7:11 am and sunset at 4:54 pm. On the last day of January, in Riverdale, California, sunrise is at 7:01 am and sunset at 5:24 pm PST.
Sunshine
The average sunshine in January in Riverdale is 6.7h.UV index
The months with the lowest UV index in Riverdale are January, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily high UV index of 3 during January translates into the following recommendations:
Take precautions - Protection against sun damage is advised. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Frequently asked questions
What is the usual temperature for Riverdale in January?
What is the most humid month in Riverdale?
What is the average humidity in January in Riverdale?
What is the rainiest month in Riverdale?
How much does it rain in Riverdale in January?
What is the average length of the day in January in Riverdale?
What time are sunrise and sunset in January in Riverdale?
How long on average sun shines in January in Riverdale?
When is the lowest UV index in Riverdale?
What is the UV index reading in January in Riverdale?
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).
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).
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).
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%).
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").
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).
Average daylight in January /
Average sunshine in January
Riverdale, CA
- Average daylight in January: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in January: 6h and 4min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
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).
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).
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).
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).
Riverdale, California, USA
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