Layers
Where the deaths were counted (7)
All-time station records, 2021 heat dome (27)
All-time station records, 1980 (29)
All-time station records, 1995 (9)
All-time station records, July 2026 (12, preliminary)
DisasterAWARE heat alert records (6)
Highest temperature at every station, 1936 (3,491; colour = °F below)
115°F or more
110–114°F
105–109°F
100–104°F
95–99°F
90–94°F
below 90°F
Highest temperature at every station, 1980 (1,578; colour = °F below)
115°F or more
110–114°F
105–109°F
100–104°F
95–99°F
90–94°F
below 90°F
Highest temperature at every station, 1995 (983; colour = °F below)
115°F or more
110–114°F
105–109°F
100–104°F
95–99°F
90–94°F
below 90°F
Highest temperature at every station, 2021 (806; colour = °F below)
115°F or more
110–114°F
105–109°F
100–104°F
95–99°F
90–94°F
below 90°F
Highest temperature at every station, 2026 (1,562; colour = °F below)
115°F or more
110–114°F
105–109°F
100–104°F
95–99°F
90–94°F
below 90°F
Heat index at airports, Jul 13, 1995, 20:00 UTC (3 pm CDT in Chicago) (185; colour below)
125°F or more (NWS: extreme danger)
103–124°F (danger)
90–102°F (extreme caution)
80–89°F (caution)
Heat index at airports, Jun 28, 2021, 23:00 UTC (4 pm PDT in Portland and Seattle) (106; colour below)
125°F or more (NWS: extreme danger)
103–124°F (danger)
90–102°F (extreme caution)
80–89°F (caution)
Heat index at airports, Jul 4, 2026, 20:00 UTC (4 pm EDT in Langley AFB and Atlantic City) (721; colour below)
125°F or more (NWS: extreme danger)
103–124°F (danger)
90–102°F (extreme caution)
80–89°F (caution)
NWS heat warning in force, California, Jul 2006 (34 of 58 zones)
NWS heat advisory only, California, Jul 2006 (24 zones)
NWS heat warning in force, 2021 heat dome (109 of 128 zones)
NWS heat advisory only, 2021 heat dome (19 zones)
NWS heat warning in force, Phoenix, Jul 2023 (51 of 66 zones)
NWS heat advisory only, Phoenix, Jul 2023 (15 zones)
NWS heat warning in force, July 2026 eastern heat (946 of 1205 zones)
NWS heat advisory only, July 2026 eastern heat (259 zones)
Areas the death figures cover (9: city, county or state)
Temperature overlays: one event at a time; switch in the layer menu. Station records are first-order weather stations with 30+ years of data. Off by default: NWS heat warnings and advisories by forecast zone (VTEC archive from 2005: 2006, 2021, 2023, 2026); highest temperature at every station (1936, 1980, 1995, 2021, 2026); airport heat index at one afternoon hour on a peak day (1995, 2021, 2026); outlines of the areas behind the local death counts (all but Milwaukee's). The IEM warning archive starts in 2005, so there are no warnings to map for 1936, 1980 or 1995.
Daily high compared with normal, Jun 25 – Jul 2, 2021
5°F or more cooler than normal
2–5°F cooler than normal
within 2°F of normal
2–5°F hotter than normal
5–10°F hotter than normal
10–15°F hotter than normal
15–20°F hotter than normal
20°F or more hotter than normal
Each day's high temperature compared with that place's normal high for the same dates, averaged over the dates shown. Red = hotter than normal; blue = cooler than normal (the heat was elsewhere). MODELED (gridded analysis of station observations): 1991–2020 normals. NOAA NClimGrid-daily and NCEI gridded daily normals.
Daily high compared with normal, Jul 11–16, 1995
5°F or more cooler than normal
2–5°F cooler than normal
within 2°F of normal
2–5°F hotter than normal
5–10°F hotter than normal
10–15°F hotter than normal
15–20°F hotter than normal
20°F or more hotter than normal
Each day's high temperature compared with that place's normal high for the same dates, averaged over the dates shown. Red = hotter than normal; blue = cooler than normal (the heat was elsewhere). MODELED (gridded analysis of station observations): 1991–2020 normals. NOAA NClimGrid-daily and NCEI gridded daily normals.
Daily high compared with normal, Jul 1–31, 1980
5°F or more cooler than normal
2–5°F cooler than normal
within 2°F of normal
2–5°F hotter than normal
5–10°F hotter than normal
10–15°F hotter than normal
15–20°F hotter than normal
20°F or more hotter than normal
Each day's high temperature compared with that place's normal high for the same dates, averaged over the dates shown. Red = hotter than normal; blue = cooler than normal (the heat was elsewhere). MODELED (gridded analysis of station observations): 1991–2020 normals. NOAA NClimGrid-daily and NCEI gridded daily normals.
