The usual sunny winter weather is interrupted a few times per month by frontal storms that bring gentle rain and cooler temperatures for a day or two. During El Niño winters such storms are much more frequent, and rarer during La Niña winters.

Retrieved from the Arizona-Sonora Desert Museum web site on 12-28-2024
http://desertmuseumdigitallibrary.org/desert/habitats_AZUTucsonMts16.php