The datasets are streamflow characteristics computed from the 1 million ensembles of the Stochastic Watershed Model for each warming scenario of 0 to 8 degrees Celsius in 0.5-degree intervals for the Squannacook River at West Groton, Massachusetts streamgage location. Each value in the files represents a streamflow characteristic computed from an ensemble that covers a period of 64 years of daily streamflows computed by the Stochastic Watershed Model. The Stochastic Watershed Model was developed at Tufts University (Shabestanipour and others, 2022). The streamflow characteristics include the 2-, 5-, 10-, 25-, 50-, 100-, and 500-year recurrence interval of the annual maximum daily streamflow and the 7-day low flow with a 2- and 10-year recurrence interval. There is one file for each streamflow characteristic. Shabestanipour, G., Broudeur, Z., Farmer, W., Steinschneider, S., Vogel, R., and Lamontagne, J., 2022, Stochastic watershed model ensembles for long-range planning—Verification and validation: Water Resources Research, v. 59, no. 2, 20 p., accessed January 3, 2024 at https://doi.org/10.1029/2022WR032201.