Change in Stream Temperature (° F)

<div><div><p><i><strong>This data resource includes layers in a map service. To download it, please go to the &quot;Layers&quot; section of this page and click the name of the dataset. This will open a new page that features a download button.</strong></i></p></div><div><strong>Access the Indicator Materials:</strong></div><div>- <a href='https://d18lev1ok5leia.cloudfront.net/chesapeakeprogress/chart-assets/stream-temperature-change-in-the-chesapeake-bay-watershed-1960-2014/Analysis_and_Methods_Stream_Water_Temperature_07-31-2018.pdf' target='_blank' rel='nofollow ugc noopener noreferrer'>Analysis &amp; Methods</a></div><div>- <a href='https://d18lev1ok5leia.cloudfront.net/chesapeakeprogress/chart-assets/stream-temperature-change-in-the-chesapeake-bay-watershed-1960-2014/Data_Stream_Water_Temperature_07-30-2018.xlsx' target='_blank' rel='nofollow ugc noopener noreferrer'>Data File</a></div><div>- <a href='https://gis.chesapeakebay.net/ags/rest/services/ChesapeakeProgress/cpClimate_StreamTemp/MapServer' target='_blank' rel='nofollow ugc noopener noreferrer'>Map Service</a></div></div><div></div><div><br /></div><div>Water temperature at each site is measured directly by U.S. Geological Survey personnel about every eight weeks using a calibrated thermometer or electronic thermistor near the water surface. Long-term monthly averages are calculated for each site, and individual measurements are converted into anomalies relative to the site-specific mean to allow comparisons across sites.</div><div></div><div><strong><br /></strong></div><div><strong>Note: This Indicator supported progress tracking toward the Monitoring and Assessment Outcome in the original Chesapeake Bay Watershed Agreement, adopted in 2014. The Watershed Agreement and Adapting to Changing Environmental Conditions Outcome were revised in 2025.</strong></div>