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 excellent 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.