---
- attributes: ~
  caption: These bar graphs and maps show changes in the number of heat waves per year (frequency) and the number of days between the first and last heat wave of the year (season length). These data were analyzed from 1961 to 2019 for 50 large U.S. metropolitan areas. The graphs show averages across all 50 metropolitan areas by decade. The size/color of each circle in the maps indicates the rate of change per decade. Hatching represents cities where the trend is not statistically significant.
  chapter_identifier: ~
  create_dt: 2019-04-10T18:11:32
  href: https://data.globalchange.gov/report/indicator-us-heat-waves-2021/figure/indicator-us-heat-waves-2021.yaml
  identifier: indicator-us-heat-waves-2021
  lat_max: 49.38
  lat_min: 24.5
  lon_max: -66.95
  lon_min: -124.8
  ordinal: 1
  report_identifier: indicator-us-heat-waves-2021
  source_citation: ~
  submission_dt: 2021-06-08T15:24:00
  time_end: 2019-12-31T00:00:00
  time_start: 1961-01-01T00:00:00
  title: Heat Waves
  uri: /report/indicator-us-heat-waves-2021/figure/indicator-us-heat-waves-2021
  url: ~
  usage_limits: Figure may be copyright protected and permission may be required. Contact original figure source for information