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 beginning of January records an average high-temperature of a still refreshing 56.5°F (13.6°C), almost echoing the conditions of the previous month. In Vallejo, an average temperature of 43°F (6.1°C) is noted during January nights.Humidity
The average relative humidity in January in Vallejo is 73%.Rainfall
In January, the rain falls for 7.7 days. Throughout January, 0.83" (21mm) of precipitation is accumulated. Throughout the year, in Vallejo, California, there are 56.9 rainfall days, and 4.88" (124mm) of precipitation is accumulated.Daylight
In January, the average length of the day is 9h and 53min.On the first day of January in Vallejo, California, sunrise is at 7:25 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 5:30 pm PST.
Sunshine
The average sunshine in January in Vallejo is 5.9h.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 average person.Note: In January, the maximum UV index of 3 translates into these guidelines:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. It's recommended to limit sun exposure when its radiation is at its peak during midday. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Frequently asked questions
What are the temperatures in Vallejo in January?
What is the average humidity in January in Vallejo?
How many days does it rain in January in Vallejo?
How many hours of daylight does Vallejo have in January?
When is the sunrise / sunset in January in Vallejo?
How long on average sun shines in January in Vallejo?
What is the month with the lowest UV index in Vallejo?
What is the UV index reading in January in Vallejo?
Average temperature in January
Vallejo, CA
- Average high temperature in January: 56.5°F
The warmest months (with the highest average high temperature) are July and September (80.1°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in January: 43°F
The month with the highest average low temperature is August (56.5°F).
The coldest month (with the lowest average low temperature) is January (43°F).
Average pressure in January
Vallejo, 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
Vallejo, CA
- Average wind speed in January: 4.9mph
The windiest month (with the highest average wind speed) is May (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).
Average humidity in January
Vallejo, CA
- Average humidity in January: 73%
The month with the highest relative humidity is March (75%).
The months with the lowest relative humidity are September and October (60%).
Average rainfall in January
Vallejo, CA
- Average rainfall in January: 0.83"
The wettest month (with the highest rainfall) is February (1.14").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in January
Vallejo, CA
- Average rainfall days in January: 7.7 days
The month with the highest number of rainy days is March (10.2 days).
The month with the least rainy days is August (0.9 days).
Average daylight in January /
Average sunshine in January
Vallejo, 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: 5h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in January
Vallejo, CA
- Average sunshine days in January: 21.8 days
The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is March (18.8 days).
Average UV index in January
Vallejo, CA
- Average UV index in January: 3
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in January
Vallejo, CA
- Average cloud cover in January: 35
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in January
Vallejo, 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).
Vallejo, California, USA
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