The Infectious risk has eased over the past 12 weeks, ending the period well below its earlier peak..
Allergy risk activity has been climbing over the past 12 weeks in Custer, Montana.
Pollution risk activity has been increasing over the past 12 weeks in Custer, Montana.
Weather risk activity has been decreasing over the past 12 weeks in Custer, Montana.
Last updated: August 31, 2026
Data refreshed weekly