Weather Calculators Wind Chill Relative Humidity Heat Index Enter a number and click the appropriate button to see result.  Temperature Conversion Fahrenheit (°F)  Celsius (°C)  Celsius (°C )  Fahrenheit (°F)   Windchill Calculation Temp (°F) Wind Speed (mph) Wind chill = Temp (°C) Wind Speed (mph) Wind chill =  Relative Humidity Calculation Temp (°F ) Dew Point (°F) Relative Humidity = Temp (°C) Dew Point (°C ) Relative Humidity =  Heat Index Calculation Valid entries are air temperatures greater than 80 °F ( 27 °C ), dew point temperatures greater than 65 °F ( 12 °C ), and relative humidities higher than 40 percent. Temp (°F ) Dew Point (°F)   RH = Temp (°C) Dew Point (°C )   RH = Temp (°F ) Relative Humidity (%) Heat Index = Dew Point = Temp (°C) Relative Humidity (%) Heat Index = Dew Point = [top]