The present climate of Massachusetts is described at: http://www.cocorahs.org/Media/docs/ClimateSum_MA.pdf
The Office of Water Resources maintains a network of approximately 60 precipitation observation stations throughout Massachusetts.
Current Water conditions reports describe precipitation trends, dry periods, high or low river flow conditions, ground water levels, and review the current water year. They can be downloaded from this page.
Information on drought management, drought maps, and a list of Massachusetts towns by drought region.
U.S. Geological Survey Cooperative Program
The Office of Water Resources administers cooperative programs with the United States Geological Survey (USGS) to provide timely scientific research and streamflow data to inform statewide policy. Cooperative Water Resource Planning Program