According to the Köppen climate classification system, Mount Otto is located in an alpine subarctic climate zone with cold, snowy winters, and cool to warm summers.[7] Due to its altitude, it receives precipitation all year, as snow in winter, and as thunderstorms in summer, with a dry period in late spring.
Etymology
The mountain's toponym was officially adopted in 1970 by the United States Board on Geographic Names to commemorate Otto Mears (1840–1931), early pioneer in the San Luis Valley and interpreter-negotiator for early Indian treaties, developer of roads, railroads, and mining and milling operations in the San Juan Mountains region.[5] Notably, he built the Million Dollar Highway, and built and operated a historic toll road over nearby Poncha Pass into the valley. There is a Mears Peak in the Sneffels Range of the San Juans which is also named after him.
^Ferdinand V. Hayden (1877), Annual Report of Progress of the Exploration for the Year 1875 Embracing Colorado, Parts of Adjacent Territories, U.S. Government Printing Office, p. 208.