Weather at Timpanogos Cave National Monument
greatly varies throughout the seasons. In winter, the canyon is often covered in a blanket of white snow. Temperatures can be very cold nearing 0° F (-18° C). In spring the temperature warms up allowing the snow to melt and it begins to rain significantly more. Summer can be very hot reaching temperatures of over 100° F (38° C). Humidity and moisture during the summer are very low. During fall, the temperature cools considerably and begins to occasionally rain. The visitor center has an average of 90 inches of snow a year and 25 inches of rain a year.
More climate information available online at Western Regional Climate Center http://www.wrcc.dri.edu/cgi-bin/cliMAIN.pl?uttimp