Why does Hanukkah usually fall in December on the Gregorian calendar?

Hanukkah begins on the 25th day of the Jewish month of Kislev. Because the Jewish calendar is a lunisolar calendar, it is regulated by the positions of both the Moon and the Sun.1234

Unlike the Gregorian calendar, which is a solar dating system, the Jewish calendar consists of 12 lunar months. To keep these lunar months aligned with the solar year, a 13th month is periodically added in a 19-year cycle. Because of this structure, the dates of Jewish festivals shift relative to the Gregorian calendar, though they generally fall within the same seasonal period. Consequently, the 25th of Kislev typically aligns with dates in December.34125