Monarchs have arrived at overwintering sites in Mexico, and it's been a few weeks since the sanctuaries opened to the public, including Sierra Chincua and El Rosario, from which Estela Romero sends her updates.

Estela passed along a couple of videos from overwintering sites in late November, which you can see on the right side of your screen on desktop or below the article on your mobile devices.

The season's higher-than-normal temperatures fell abruptly as an unusually early winter storm hit portions of California and the Southwest this week. Temperatures plummeted, and snow even fell in the Sierra’s higher elevations. Earlier, monarchs had continued to arrive at the safety of the coastal overwintering sites, settling in for the season.