Hanukkah and Christmas Day coinciding is a relatively rare occurrence. Hanukkah is based on the lunisolar Hebrew calendar, and varies each year against the western calendar. Christmas, on the other hand, is fixed on December 25th.
Hanukkah starts on the 25th of Kislev in the Hebrew calendar, and this can fall anywhere from late November to late December.
The overlap with Christmas Day happens occasionally, but not frequently. For example, in recent history, Hanukkah started on December 25 in 2005 and 2016. After 2024, the next time Hanukkah will start on Christmas Day is in 2061. So while it does happen, it's not a common occurrence!
