Weather in Diamond Bar in December
Diamond Bar, United States averages a high of 17.5°C (63.5°F) and low of 6.1°C (43°F) in December, with 5 rain days and 8.3 hours of daily sunshine. Travel score: 77.9/100 (Good). The best time to visit Diamond Bar is July.
High
18°C64°F
Low
6°C43°F
🌧️
5
rain days
☀️
8.3
hrs/day sunshine
💧
64%
humidity
78— Good
December in Diamond Bar is mild and mostly dry — good for most activities.
What are the average temperatures in Diamond Bar?
How much does it rain in Diamond Bar in December?
Diamond Bar receives an average of 63.3mm of rainfall across 5 rainy days in December. The annual total is 393.2mm.
What should I pack for Diamond Bar in December?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Mix of light and warm layers
Mild temperatures around 18°C
Recommended
🧴
Sunscreen
Sun protection is still recommended
🕶️
Sunglasses
Useful for sunny periods
🎉Visiting United States in December?
Don't miss any public holidays — check before you book!
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Data based on 1994–2024 averages · Last updated: 2024-12-31