The best replacement for humidity is relative humidity.

The best alternatives to humidity are rated as following:
★★★★★  relative humidity
★★★★★  dew point
★★★★  temperature
★★  dry heat
★★  moisture
★  humidity
★  absolute humidity
★  temp
★  dry air
  water vapor
  air pressure
  rain
  high humidity better
  temperature comfort
  outside temperature
  air temperature
  evaporation
  low humidity
  specific humidity
  high humidity
  precipitation
  dewpoint
  air density
  esd
  air conditioning
  outdoor temperature
  dew
  corrosion
  with low humidity

Your alternative for humidity is not listed? Suggest!
Speaking about humidity, one probably shouldn't forget about temperature.

Other search terms related to humidity and their ratings are:
★★★★★ temperature
★ oxymizer
★ temperature and dew point
★ thermometer
wet bulb
oxygen
temperatures
You have in mind a companion for humidity and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of humidity in all years. Click on graph for more.
humidity
relative humidity
dew point