Fullerton Weather in December

December in Fullerton averages 20°C (68°F) during the day and 8°C (46°F) at night. It is the wettest month of the year, with 67 mm (2.6 in) of rainfall on average, so waterproof gear is a must.

Rainfall in Fullerton in December

As the month with the highest rainfall, make sure to have an umbrella to manage the showers. Historically, approximately 8 days this month are expected to have rain, averaging 67 mm (2.6 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Fullerton in December

If you're visiting Fullerton in December, expect perfect temperatures with highs of 20°C (68°F) and overnight lows of 8°C (46°F). The winter season is characteristic of December. Conditions are often most pleasant around the middle of the day. With overnight lows of 8°C (46°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets. Expect mild temperatures during this month, but it stays comfortably warm and inviting. It is the coolest month of the year.

Sunshine in Fullerton in December

Expect sunny days throughout the month, with an estimated 205 hours of sunshine. This makes it a pleasant time to visit Fullerton.

If you're a fan of comfortable temperatures and drier conditions, December is a great time to visit.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Fullerton's climate page.

Fullerton Temperature in December

Min Temperature 8°C (46°F)  

Max Temperature 20°C (68°F)  

Chance of Rain 27%  

Precipitation 67 mm (2.6 in)  

Rainy days 8 days  

Sunshine 205 hours *  

Percentage Sunshine *  

* Data from: Corona, the United States of America (33 KM, 20 Miles).

What to Wear in Fullerton in December

Comfortable temperatures call for an easy wardrobe in December. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Fullerton in December

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

Cycling

10/10

Walking

10/10

Barbeque

8/10

Camping

4/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Fullerton's climate page.

More climate data for Fullerton

Temperature Rainfall Sunshine

See the full Fullerton climate overview or explore weather in the United States of America.