15-minute measurements of water temperature, dissolved carbon dioxide, and air carbon dioxide concentration in 10 New Hampshire and Massachusetts streams, 2015-2020.

Water temperature, dissolved carbon dioxide, and air carbon dioxide were measured at 10 streams and rivers in New Hampshire and northeast Massachusetts during snow-free periods (roughly April to November) at 15-minute intervals, from 2015 to 2020. Five sites were part of the New Hampshire EPSCoR High Intensity Aquatic Network, three sites are part of the Plum Island Ecosystems LTER, and two sites are part of long-term monitoring projects of the Oyster River watershed near Durham, NH.