Rare summer snowfall occurred overnight in the Sierra Nevada in California.

The snow was spotted by an official in eastern Madera County in Minaret Vista, who posted the video on his Facebook page on Saturday, August 24.

“Although snow is rare this time of year, it reminds us of the unpredictable nature of our beautiful Sierra Nevada. If you plan to visit, please drive carefully and be prepared for the chilly weather,” the Madera County Sheriff’s Office said on its Facebook page.

Snow was also measured on the 3,337-meter-high summit of Mammoth Mountain.

“It was cool this morning. Check out the layer of fresh snow on the middle and upper mountain,” Mammoth Mountain officials said on Instagram.

You can also see the snow on Mammoth Mountain’s live webcam page.

The National Weather Service has issued a warning to hikers and campers in the area to prepare for winter weather conditions, including slick roads.