Extreme levels of heat and humidity are forecast to spread across the country over the next two weeks, blanketing the Southwest, Midwest, and East Coast with high temperatures beginning this June 19 ...

The temperature on any given summer day may be in the 80s or 90s. So why does it feel so much hotter and oppressive at times? That's the heat index doing its thing. Here's how it works: What is the ...

Relative humidity is not a good way to tell if we have muggy air on the way. Here’s why. The key word in relative humidity is ...

Extreme heat waves can cause cases of dehydration, exhaustion, heat stroke and even death. But the air temperature isn't the only factor in how dangerous a hot day is; there's also another measure, ...

The iTHX-SD transmitter lets users view virtual charts and record temperature, relative humidity and dew point over an Ethernet network or the Internet with no special software—just a Web browser. The ...