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New research shows that while winter rains can temper the beginning of the wildfire season, monsoon rains are what shut them down. This monsoon season was the second-driest on record, leaving Southern Arizona dry and vulnerable.Associated journal article: Alexis H. Arizpe, Donald A. Falk, Connie A. Woodhouse, Thomas W. Swetnam. Widespread fire years in the US–Mexico Sky Islands are contingent on both winter and monsoon precipitation. International Journal of Wildland Fire, 2020; DOI: 10.1071/WF19181