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Castro Valley weather in December (California, United States of America)

How is December weather typically in Castro Valley? This guide provides the necessary weather information for your travel plans.

Temperatures

In December, Castro Valley usually has moderate temperatures and high rainfall. December is part of winter. During the day, temperatures can climb to about 14°C. At night, they may fall to a cooler 5°C. December usually brings the most temperate weather conditions of the year.

Precipitation

Castro Valley in December usually receives high rainfall, averaging around 111 mm for the month. Given that this is the rainiest month, it's wise to carry an umbrella to stay dry during unexpected showers. On average, there are about 13 days with rain during this month.

Average sunshine

The month experiences a moderate amount of sunlight, with 160 hours hours. A nice balance between sunshine and clouds.

If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit Castro Valley. May, June, July, August, September and October typically offer the most agreeable circumstances. On the other hand, December tends to be characterized by conditions that may not be as optimal.

Need inspiration to choose your next destination? Our innovative weather planner helps you discover the perfect getaway tailored to your ideal climate conditions.

 

Castro Valley, monthly averages in December

Min TemperatureMin Temperature 5°C  
Max TemperatureMax Temperature 14°C  
Chance of RainChance of Rain 44%  
PrecipitationPrecipitation 111 mm  
Rainy daysRainy days 13 days  
HumidityHumidity 78% *  
SunshineSunshine 160 hours *  
Percentage SunshinePercentage Sunshine 54% *  
Data from: San Francisco, the United States of America (27 KM, 17 Miles).

Where to go in the United States of America in December

Find out more about the weather in the United States of America and which places have the best travel conditions in this month.

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

Plan on layering your clothes. Some days or part of the day it will be nice and warm and some moments it can be a bit chilly. Bring a rain jacket in case it rains during your stay.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming
5/10
Cycling
5/10
Walking
5/10
Camping
3/10
Outdoor sports
9/10

Interested in more climate information?

This site provides you with all the information you need about the climate in Castro Valley.

Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.