Misschien interessant om te vergelijken, er zit ontzettend veel variatie op blijkbaar 
| Country | Definition | Source / Notes |
|---|---|---|
| Norway | ≥ 27?°C for 5 consecutive days | Norwegian Meteorological Institute |
| Belgium | ≥ 25?°C for 5 consecutive days, with at least 3 days ≥ 30?°C | Royal Meteorological Institute of Belgium |
| Netherlands | ≥ 25?°C for 5 consecutive days, with at least 3 days ≥ 30?°C | KNMI (Royal Netherlands Meteorological Institute) |
| France | Thresholds vary by region; generally ≥ 3 days with minimum and maximum temperatures unusually high | Météo-France defines based on local climate, e.g. > 35°C daytime / > 20°C night |
| UK | Daily maximum exceeds regional threshold (ranging from 25 to 28?°C) for 3 consecutive days | UK Met Office, thresholds vary by region |
| Germany | No fixed national definition; DWD uses daily max ≥ 30?°C as a heat day, 3+ in a row often used | German Weather Service (DWD) |
| Sweden | Daily max ≥ 25?°C for at least 5 consecutive days | Swedish Meteorological and Hydrological Institute |
| Finland | Heat day: max ≥ 25?°C; no formal heatwave threshold, but 5+ heat days often considered one | Finnish Meteorological Institute |
| Spain | ≥ 3 consecutive days with unusually high temps for the area, typically > 36–40?°C | AEMET (Spanish Meteorological Agency), regionally adapted |
| Portugal | Temps ≥ 5?°C above normal for at least 6 days | IPMA (Portuguese Institute for the Sea and Atmosphere) |
| Italy | No formal definition; Ministry uses > 35?°C for 3+ days, especially if night temps stay > 20?°C | Health and civil protection guidelines |
| Switzerland | ≥ 3 days with temps > 30?°C and nighttime temps > 20?°C | MeteoSwiss |
| USA | Varies by region; often defined as ≥ 3 days with max > 90°F (32.2?°C) + high humidity | National Weather Service |
| Canada | Varies by province; example: Southern Ontario: ≥ 3 days ≥ 32?°C and nighttime > 20?°C | Environment Canada |
| Australia | Varies regionally; often defined as 3+ days with unusually high temps for that area | Bureau of Meteorology; no national threshold |
| India | ≥ 40?°C in plains, ≥ 37?°C in coastal areas, ≥ 30?°C in hills for 2+ days | India Meteorological Department |
| China | Max temperature ≥ 35?°C for 3+ consecutive days | China Meteorological Administration |
| Japan | Max temp ≥ 35?°C is classified as an extremely hot day; no formal "heatwave" term used | Japan Meteorological Agency |
| South Africa | 5+ days with daily max at least 5?°C above the average maximum for the hottest month | South African Weather Service |
| Russia | 5+ days with temps 5?°C above the long-term average for the period | Roshydromet (Federal Hydrometeorological Service) |
Bericht laatst bijgewerkt: 23-07-2025 12:25
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