Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The heat index is a measure of how hot it really feels when relative humidity is factored in to the actual air temperature. The red zone without numbers indicates extreme danger. Temperature °F = (°C × 1.8) + 32. Source: National Oceanic and Atmospheric Administration, National Weather Service (15).
