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Monthly precipitation in 2021 at the Boulder, Colorado, weather station (blue bars) compared to average (white line). Spring is generally wetter than summer and fall in the foothills of the Rockies, but last spring was exceptionally wet, and summer and fall were exceptionally dry. Background photo shows the foothills area in September 2014. NOAA Climate.gov image, based on data from NWS Denver-Boulder Forecast Office and photo by Flickr user MikeB, used under a Creative Commons license. {Correction, 09/29/22: An earlier version of this image incorrectly showed data for Denver International Airport, south of Boulder. It has been updated with Boulder data. The main monthly patterns in both places were similar.}