Weather in Fullerton in December
Fullerton, United States averages a high of 18.5°C (65.3°F) and low of 7.2°C (45°F) in December, with 5 rain days and 8.4 hours of daily sunshine. Travel score: 78.6/100 (Good). The best time to visit Fullerton is August.
High
19°C65°F
Low
7°C45°F
🌧️
5
rain days
☀️
8.4
hrs/day sunshine
💧
67%
humidity
79— Good
December in Fullerton is mild and mostly dry — good for most activities.
What are the average temperatures in Fullerton?
How much does it rain in Fullerton in December?
Fullerton receives an average of 52.7mm of rainfall across 5 rainy days in December. The annual total is 311.3mm.
What should I pack for Fullerton in December?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Mix of light and warm layers
Mild temperatures around 19°C
Recommended
🧴
Sunscreen
Sun protection is still recommended
🕶️
Sunglasses
Useful for sunny periods
Traveling to United States in December?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31