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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. These can be calculated automatically using Wildland Fire RH Calculator …

This table gives the approximate relative humidity directly from the reading of the air temperature (dry bulb) and the wet bulb. It is computed for a pressure of 74.27 cm Hg.

Learn how to use a relative humidity table or chart to determine the relative humidity based on dry and wet bulb temperatures.

Relative humidity is the ratio between the pressure of the water vapor present in the air, to the pressure of the vapour saturating the air at the same temperature

Use our relative humidity charts to find the proper humidity level in your house. Outside of this range, your air and your body are more susceptible to airborne pollutants such as allergens, mold, mildew, and viruses.

Relative humidity is usually expressed in per cent and abbreviated by φ or RH. Relative humidity as the ratio of vapor partial pressure in the air - to the saturation vapor partial pressure if the air at the actual dry bulb temperature. pws = saturation vapor partial pressure at the actual dry bulb temperature (mbar).

Relative Humidity Table Derived From Web-Bulb and Dry-Bulb Temperatures (°C) This table gives the approximate relative humidity directly from the reading of the air temperature (dry bulb) and the wet bulb.