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Heat Wave Characteristics in 50 Large U.S. Cities, 1961–2023
These maps show changes in the number of heat waves per year (frequency); the average length of heat waves in days (duration); the number of days between the first and last heat wave of the year (season length); and how hot the heat waves were, compared with the local temperature threshold for defining a heat wave (intensity). These data were analyzed from 1961 to 2023 for 50 large metropolitan areas. The size of each circle indicates the rate of change per decade. Solid-color circles represent cities where the trend was statistically significant. For more information: www.epa.gov/climate-indicators
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| contactPoint |
{ "fn": "U.S. Environmental Protection Agency, Office of Air and Radiation", "@type": "vcard:Contact", "hasEmail": "mailto:bacanskas.lisa@epa.gov" } |
| describedByType | application/octet-steam |
| description | These maps show changes in the number of heat waves per year (frequency); the average length of heat waves in days (duration); the number of days between the first and last heat wave of the year (season length); and how hot the heat waves were, compared with the local temperature threshold for defining a heat wave (intensity). These data were analyzed from 1961 to 2023 for 50 large metropolitan areas. The size of each circle indicates the rate of change per decade. Solid-color circles represent cities where the trend was statistically significant. For more information: www.epa.gov/climate-indicators |
| distribution |
[ { "@type": "dcat:Distribution", "accessURL": "https://geodata.epa.gov/arcgis/rest/services/OAR_OAP/HeatWaves/MapServer", "mediaType": "text/html", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "accessURL": "https://www.epa.gov/climate-indicators", "mediaType": "text/html", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "accessURL": "https://www.epa.gov/climatechange", "mediaType": "text/html", "describedByType": "application/octet-stream" } ] |
| identifier | https://edg.epa.gov/WAFer_harvest/ISO/oar-oap-geo-records_HeatWaves_esri_061124update.xml |
| keyword |
[ "United States", "020:072", "Air", "Climate", "Climate", "Health", "Weather", "Heat Waves", "Urban", "Cities", "Heat", "Indicator", "Other Documents" ] |
| language |
[]
|
| license | https://creativecommons.org/publicdomain/zero/1.0/ |
| modified | 2026-05-20T00:00:00.000+00:00 |
| publisher |
{ "name": "U.S. Environmental Protection Agency, Office of Air and Radiation", "@type": "org:Organization" } |
| theme |
[ "geospatial" ] |
| title | Heat Wave Characteristics in 50 Large U.S. Cities, 1961–2023 |
