Google often revives winter-themed features during December. While "Let It Snow" might not always trigger the frost effect, searching for "Christmas," "Hanukkah," or "Kwanzaa" often triggers a festive header or a shower of themed confetti. 3. Google Santa Tracker
For further research, run a live Google Trends report or check Google’s Doodle archive. let it snow google
Virtual snow began falling across the search results. Google often revives winter-themed features during December