Above what grade is heat dangerous?
Sure! Converting those exact same thresholds into Celsius helps clarify exactly when the danger rises.
1. Environmental Heat: The Heat Index Categories (in Celsius)
The National Weather Service categories converted to Celsius show how humidity impacts how the temperature actually feels to your body.
| Heat Index (Feels Like) | Danger Category | What Happens to the Body |
|---|---|---|
| 27°C to 32°C | Caution | Fatigue and muscle weakness are possible if you are exercising or working outside for a long time. |
| 32°C to 39°C | Extreme Caution | Heat stroke, heat cramps, and heat exhaustion become possible for anyone, and likely for vulnerable groups. |
| 39°C to 51°C | Danger | Heat cramps and heat exhaustion are likely. Heat stroke becomes a very real possibility with prolonged outdoor activity. |
| 52°C or higher | Extreme Danger | Heat stroke is highly likely for anyone exposed for an extended period. This is a lethal environment. |
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