Cali UV index in December
Typical ultraviolet levels for Cali during December, from the past year of data.
Extreme
Cali
Extreme UV. Avoid sun exposure, seek shade, and use comprehensive protection: clothing, sunscreen, and a hat.
11.8
UV Index
December average UTC
Low
Moderate
High
Very High
Extreme
December UV
11.7846
Risk level
Extreme
Yearly peak
15.5098
Peak month
April
Cali UV index — monthly trend
Average UV index by month over the past year, with December highlighted.
Visiting Cali in December?
In December, Cali's typical UV index is about 11.7846 — a extreme risk level. Extreme UV. Avoid sun exposure, seek shade, and use comprehensive protection: clothing, sunscreen, and a hat.
Across the year, Cali sees the strongest UV in Spring, peaking around 15.5098 in April. Plan sun protection accordingly.
