The amount, timing, and form of precipitation (rain, sleet, or snow) directly affect the amount and timing of runoff into rivers and streams, particularly in northern and mountainous areas. If air temperatures were to warm in the future, the warming could decrease the fraction of precipitation occurring as snow or speed the start of spring snowmelt causing streamflow to occur earlier in the year with potential consequences for some aquatic life and human activities. Using long-term streamflow records from the U.S. Geological Survey (USGS) National Streamflow Information Program, it is possible to evaluate changes in the timing of streamflow of New England streams.