According to the National Oceanic and Atmospheric Administration, heat is the No. 1 weather-related killer in the United States. It is the responsibility of every employer to ensure employees are kept safe during high heat conditions.
Extreme caution must be taken when the heat index exceeds 90° F. The heat index is a measure of how hot it feels when relative humidity is added to the actual air temperature. A temperature of 90° F with 10% humidity will result in a heat index of 85° F, but with 60% humidity the heat index soars to 100° F.