Valid entries are, air temperatures greater than 80 ☏ ( 27 ☌ ), dew point temperatures greater than 65 ☏ ( 12 ☌ ), and relative humidities higher than 40 percent.Įnter in the air temperature ( T air ) and the dew point temperature ( T dp ) in degrees Celsius, then click on the Calculate HI to compute the heat index ( HI).Įnter in the air temperature ( T air ) the dew point temperature ( T dp ) in degrees Fahrenheit, then click on the Calculate HI to compute the heat index ( HI).Įnter in the air temperature ( T air ) in degrees Celsius and relative humidity ( RH ) in percent ( without the % sign ), then click on the Calculate HI to compute the heat index ( HI ).Įnter in the air temperature ( T air ) in degrees Fahrenheit and relative humidity ( RH ) in percent ( without the % sign ), then click on the Calculate HI to compute the heat index ( HI ). When the moisture content remains constant and temperature increases, relative humidity decreases, but the dew point remains constant. Relative Humidity Calculation using degrees CelsiusĮnter in the air temperature ( T air ) and dew point temperature ( T dp) in degrees Celsius ( oF ) then click on the Calculate RH to compute the relative humidity ( RH ). A relative humidity of 100 indicates the dew point is equal to the current temperature and that the air is maximally saturated with water. It calculates values using the August-Roche-Magnus approximation, which implies that saturation vapor pressure changes approximately exponentially with temperature under. Calculates air temperature, dew point temperature, or relative humidity when you know any two of these three values. The formula to calculate relative humidity is: RH (e / es) x 100 Where RH is the relative humidity expressed as a percentage, e is the vapor pressure of the water in the air, and es is the saturation vapor pressure at the same temperature. This workbook will calculate dew point temperatures and pressures using. Temperature, Dewpoint, and Relative Humidity Calculator. Relative Humidity Calculation using degrees FahrenheitĮnter in the air temperature ( T air ) and dew point temperature ( T dp) in degrees Fahrenheit ( oF ) then click on the Calculate RH to compute the relative humidity ( RH ). Various gases are generated and used by maintaining the humidity temperature under. Graph of the dependence of the dew point upon air temperature for several levels of relative humidity. Wind Chill/Temperature Index Calculation in degrees CelsiusĮnter in the air temperature ( T air ) in degrees Celsius and wind speed in miles per hour, then click on the Calculate WC to compute the windchill ( WC ). The dew point is the temperature to which air must be cooled to become saturated with water. Wind Chill/Temperature Index Calculation in degrees FahrenheitĮnter in the air temperature ( T air ) in degrees Fahrenheit and wind speed in mile per hour ( mph ), then click on the Calculate WC to compute the windchill ( WC ).įor more information about windchill (ie. Temperature Conversion Enter a number then click on the appropriate number to see the result. Another available tool is an online Dew Point calculator.Įlevation 0-500 feet (0-300 feet in Alaska), 30 in.Įlevation 501-1,900 feet (301-1,700 feet in Alaska), 29 in.Įlevation 1,901-3,900 feet (1,701-3,600 feet in Alaska), 27 in.Įlevation 3,901-6,100 feet (3,601-5,700 feet in Alaska), 25 in.Įlevation 6,101-8,500 feet (5,701-7,900 feet in Alaska), 23 in.Įlevation 8,501-11,000 feet (above 7,900 feet in Alaska), 21 in.Great thanks to Ron Murphy of WFO Binghamton NY for writing all of the code used on this page!įor more information about the indices and equations used These can be calculated automatically using Wildland Fire RH Calculator Apps for iOS and Android available for free.Ĭlick here to obtain a full set of tables in PDF form. The following tables calculate Dew Point and Relative Humidity based on the observed wet bulb and dry bulb temperatures and the elevation at the site of the observation. Elevation 3,901-6,100 feet (3,601-5,700 feet in Alaska), 25 in. Use the sliders to explore combinations of temperature (T), relative humidity (RH), and dew point (DP) to compare the preservation quality of your environment. A convenient, precise and customizable psychrometric chart & calculator tool for HVAC.Elevation 501-1,900 feet (301-1,700 feet in Alaska), 29 in. According to IPl's definition: The Dew Point temperature is the temperature at which the relative humidity will reach 100 and moisture will begin to.You can find more on this topic below the tool. Elevation 0-500 feet (0-300 feet in Alaska), 30 in. This relative humidity calculator can estimate the relative humidity, air temperature or dew point temp by taking account of the rest of the two variables from the formula.
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