This indicator tracks occurrences of extreme weather events at four Basin Boundary weather stations over the past century. Two indices are analysed: the annual number of warm days and the annual amount of rain falling on very wet days. “Warm Days” are defined as days when the maximum temperature exceeds the 90th percentile for that day of the year, calculated using a 30-year baseline period. “Very Wet Days” are defined as days when one-day rain values exceed the 95th percentile for that year. These methodologies are based on the CLIMDEX indices of weather extremes (for more information, see www.climdex.org). Raw data were acquired from the Pacific Climate Impacts Consortium’s Provincial Climate Data Set Portal and from the National Climate Information Archive. Analysis was completed by the RDI research team.