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
January's weather records an average high-temperature of a moderate 55.9°F (13.3°C), showing little deviation from December. During the month of January, the nighttime temperature in Rio Vista falls to an average of 41.5°F (5.3°C).Humidity
January and March, with an average relative humidity of 74%, are the most humid months in Rio Vista.Rainfall
In Rio Vista, California, in January, during 8.7 rainfall days, 1.93" (49mm) of precipitation is typically accumulated. Throughout the year, in Rio Vista, California, there are 68.7 rainfall days, and 11.18" (284mm) of precipitation is accumulated.Daylight
In Rio Vista, the average length of the day in January is 9h and 52min.On the first day of January in Rio Vista, California, sunrise is at 7:23 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 5:28 pm PST.
Sunshine
In Rio Vista, the average sunshine in January is 6.1h.UV index
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A typical high UV index of 3 in January suggests the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Frequently asked questions
What is the usual temperature for Rio Vista in January?
What are the most humid months in Rio Vista?
What is the average humidity in January in Rio Vista?
How many days does it rain in January in Rio Vista?
How many hours of daylight does Rio Vista have in January?
When are sunrise and sunset in January in Rio Vista?
How long on average sun shines in January in Rio Vista?
What are the months with the lowest UV index in Rio Vista?
What is the UV index intensity in January in Rio Vista?
Average temperature in January
Rio Vista, CA
- Average high temperature in January: 55.9°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (55°F).
- Average low temperature in January: 41.5°F
The month with the highest average low temperature is September (58.1°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).
Average pressure in January
Rio Vista, 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 (29.91"Hg).
Average wind speed in January
Rio Vista, CA
- Average wind speed in January: 4.8mph
The windiest month (with the highest average wind speed) is June (7.6mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).
Average humidity in January
Rio Vista, CA
- Average humidity in January: 74%
The months with the highest relative humidity are January and March (74%).
The month with the lowest relative humidity is September (49%).
Average rainfall in January
Rio Vista, CA
- Average rainfall in January: 1.93"
The wettest month (with the highest rainfall) is February (2.17").
The driest month (with the least rainfall) is August (0").
Average rainfall days in January
Rio Vista, CA
- Average rainfall days in January: 8.7 days
The month with the highest number of rainy days is March (13 days).
The month with the least rainy days is August (0.7 days).
Average daylight in January /
Average sunshine in January
Rio Vista, 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 36min).
- Average sunshine in January: 6h and 1min
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 54min).
Average sunshine days in January
Rio Vista, CA
- Average sunshine days in January: 21.1 days
The month with the most sunshine days is August (29.9 days).
The month with the least sunshine days is March (17.3 days).
Average UV index in January
Rio Vista, CA
- Average UV index in January: 3
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in January
Rio Vista, CA
- Average cloud cover in January: 34
The months with the most cloud cover are March and December (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in January
Rio Vista, 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).
Rio Vista, California, USA
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