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
During January, Vacaville records an average high-temperature of a refreshing 55.8°F (13.2°C), marking a slight divergence from December's 54.7°F (12.6°C). Throughout January, the temperature in Vacaville, California, falls to an average low of 41.4°F (5.2°C).Humidity
In January, the average relative humidity in Vacaville is 73%.Rainfall
In January, in Vacaville, the rain falls for 7 days. Throughout January, 0.83" (21mm) of precipitation is accumulated. Throughout the year, there are 47.1 rainfall days, and 4.17" (106mm) of precipitation is accumulated.Daylight
In January, the average length of the day is 9h and 52min.On the first day of the month, sunrise is at 7:24 am and sunset at 4:57 pm. On the last day of January, in Vacaville, sunrise is at 7:13 am and sunset at 5:28 pm PST.
Sunshine
In January, 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. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In January, the average maximum UV index of 3 translates into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Vacaville in January?
What is the average humidity in January in Vacaville?
How many days does it rain in January in Vacaville?
How many hours of daylight does Vacaville have in January?
When are sunrise and sunset in January in Vacaville?
How many hours of sunshine does Vacaville have in January?
What are the months with the lowest UV index in Vacaville?
What is the UV index intensity in January in Vacaville?
Average temperature in January
Vacaville, CA
- Average high temperature in January: 55.8°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (54.7°F).
- Average low temperature in January: 41.4°F
The month with the highest average low temperature is September (58.1°F).
The coldest months (with the lowest average low temperature) are January and December (41.4°F).
Average pressure in January
Vacaville, CA
- Average pressure in January: 30.14"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in January
Vacaville, CA
- Average wind speed in January: 4.7mph
The windiest months (with the highest average wind speed) are May and June (6.8mph).
The calmest months (with the lowest average wind speed) are January and November (4.7mph).
Average humidity in January
Vacaville, CA
- Average humidity in January: 73%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is September (48%).
Average rainfall in January
Vacaville, CA
- Average rainfall in January: 0.83"
The wettest month (with the highest rainfall) is February (0.87").
The driest months (with the least rainfall) are July, August and September (0.04").
Average rainfall days in January
Vacaville, CA
- Average rainfall days in January: 7 days
The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is August (1 days).
Average daylight in January /
Average sunshine in January
Vacaville, 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 30min).
- Average sunshine in January: 5h and 5min
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 42min).
Average sunshine days in January
Vacaville, CA
- Average sunshine days in January: 23 days
The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is February (21.5 days).
Average UV index in January
Vacaville, 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
Vacaville, CA
- Average cloud cover in January: 36
The months with the most cloud cover are March and December (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 5).
Average visibility in January
Vacaville, 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).
Vacaville, California, USA
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