Growing Degree Days Map: All Scenarios

<hr /> <p> <span><strong>Deprecation Warning</strong>: On June 1 2026, this item will no longer be available. </span> For more information on transitioing layers visit: <a target='_blank' href='https://gis-kingcounty.opendata.arcgis.com/pages/inspect-gis-data-1' rel='nofollow ugc noopener noreferrer'>Update Deprecated Items | King County GIS Open Data</a> </p> <hr /><p><span style='font-weight:bold;'>A pre-configured, multi-layer web map for viewing all Growing Degree Days scenarios.</span> <span style='font-style:italic;'>(To launch the map from the Climate Change Open Data site, select &quot;View Metadata&quot; under the &quot;About&quot; heading, then look for the button labeled &quot;Open in Map Viewer&quot; to the upper right.) </span><br /></p><p>The map layers depict historical and projected changes in growing degree days (GDD), a measure of heat accumulation in plants which indicates cumulative seasonal warming above a base temperature of 50°F. Geographic units: HUC10. <br /></p><p>Map layer data include historical (1970-1999) values plus two projections each for two future time periods, 2050s (2040-2069) and 2080s (2070-2099), based on lower and higher greenhouse gas emission scenarios, RCP 4.5 and RCP 8.5. <br /></p><p>Data classes and symbology by Robert Norheim, Climate Impacts Group, based on the CMIP5 projections used in the IPCC 2013 report. <br /></p><p>Data source: Mote et al. 2015.</p>