Normal weather for Vallejo in December
It's cool to moderate in December in Vallejo with an average temperature of 15°C. Temperatures this month range from a low of 13°C to a high of 17°C. At night, you can expect temperatures between 2°C and 8°C.
In December, there is an average of 139 mm of precipitation, spread over 17 days. The wind speed is around 3 Bft, mostly coming from the Southeast.
Vallejo in December |
New York | ||
|---|---|---|---|
 Average Temperature |
15°C | 9°C | |
 High Temp |
17°C | 12°C | |
| Low Temp |
13°C | 4°C | |
 Total Precipitation |
139 mm | 133 mm | |
| Rainy Days |
17 days | 17 days | |
Start of December
The month of December starts in Vallejo with cool temps, averaging around 16°C during the day and nights around 8°C. You can expect regular precipitation, but there will also be some sunny days in the early part of the month.
With the temperature difference between day and night, it’s smart to wear layers. During the day, choose a light jacket, sweater or hoodie, and long pants. In the evening and morning, go for a warm jacket, sweater or hoodie, and long pants.
Mid December
By mid-December, daytime temps drop to around 15°C, with nights around 6°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
Since it cools down at night, it’s a good idea to wear layers. During the day, choose a light jacket, sweater or hoodie, and long pants. For the evening and morning, we recommend a thick jacket, sweater, and long pants.
End of December
By the end of December, the average daytime temperature in Vallejo is around 14°C, while nighttime temps are about 4°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
Because temperatures drop in the evening, wearing layers is recommended. During the day, choose a light jacket, sweater or hoodie, and long pants. For the evening and morning, we recommend a thick jacket, sweater, and long pants.
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UV index
The UV index is a maximum of 4 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Is December a good time to visit Vallejo?
Looking for sun and warm weather? December isn’t a good month to be in Vallejo. The temperatures are too low for a warm stay this month.
Temperature records for Vallejo in December
Check out the climate of Vallejo for all months and discover the best travel time
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Daily Temperature in December in Vallejo
This chart shows the average daily high and low temperatures in December for Vallejo, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in December in Vallejo
The chart below shows the average daily precipitation in December for Vallejo, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for December, you can expect about 17 days of precipitation in Vallejo.
Daily UV Index in December in Vallejo
This chart shows the average daily UV index in December in Vallejo, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in December in Vallejo Over the Years
This chart shows the average temperature in December in Vallejo, measured in degrees Celsius, over the past few years.
Total Precipitation in December in Vallejo Over the Years
This chart shows the average precipitation in December in Vallejo, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily Climate in December for Vallejo
Click on any day in December to get detailed info about the usual weather on that day in Vallejo. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in December in Vallejo
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Average Weather in Vallejo by Month
Click on a month below to see detailed weather info for Vallejo. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
