Ferrera is a municipality in the Viamala Region in the Grisons, Switzerland. It was formed on 1 January 2008 through the merger of Innerferrera and Ausserferrera. Geographically, it covers the entire Ferrera valley.
The combined historical population of the two municipalities is given in the following table:
Innerferrera village in Ferrera has an average of 118.2 days of rain per year and on average receives of precipitation. The wettest month is August during which time Innerferrera receives an average of of precipitation. During this month there is precipitation for an average of 12.2 days. The month with the most days of precipitation is May, with an average of 13.3, but with only of precipitation. The driest month of the year is February with an average of of precipitation over 12.2 days.