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NBC Action Weather Plus Calculators
Have you ever wondered how relative humidity affects how hot it really feels outside? Confused about what the dew point really is? You can learn all about these and other weather terms with our interactive NBC Action Weather Plus Calculators below.

Heat Index Calculator
(using Relative Humidity)
Temperature:   ° F
Relative Humidity:   %
  ° F

Related weather definitions from NBC Action Weather Plus:

 • temperature – the amount of heat or cold measured on a thermometer.
 • relative humidity – a percentage of moisture in the air compared to what it can hold at that temperature.
 • heat index – a measure of how hot it feels when relative humidity is added to the actual air temperature.

NBC Action Weather Plus Calculators:
 • Barometric Pressure Conversions
 • Cloud Base Calculator
 • Density Altitude Calculator
 • Dew Point Calculator
 • Fahrenheit / Celsius Conversion
 • Heat Index Calculator 1
 • Heat Index Calculator 2
 • Relative Humidity Calculator
 • Relative Humidity / Dew Point Calculator
 • Wind Chill Calculator
 • Wind Velocity

Learn more weather terminology here.



Current Conditions
49°
Mostly Cloudy
High 57° Low 43°
Feels like 46°
Barometer 30.02 in.
Humidity 100%
Visibility 7 Miles
Dewpoint 49°
Wind SE 7 mph
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