# Extreme Heat Probability
The extreme heat probability refers to the hazard of [environmental](/api-data-layers/climate-analytics/universal-thermal-climate-index.md) conditions can cause to the human body. This layer refers to the probability of exceeding specific UTCI (University Thermal Climate Index) values.
| Name | Threshold | Description |
|---|
| Extreme | >46 Celsius | Extreme heat stress |
| High | >38 and <46 Celsius | Very strong heat stress |
| Moderate | >32 and <38 Celsius | Strong heat stress |
| Low | >26 and <32 Celsius | Moderate heat stress |
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