Thresholds for Extreme Heat
Below are preliminary Heat Index (HI) thresholds for extreme heat*. These thresholds will be updated as more data become available.
Region Number | Heat Index Threshold (°F) |
1 | 101 |
2 | 103 |
3 | 102 |
4 | 100 |
5 | 99 |
6 | 94 |
7 | 101 |
*Appropriate region groupings for each jurisdiction can be obtained from the map below. Counties are grouped based on similar HI thresholds.