The best replacement for relative humidity is humidity.

The best alternatives to relative humidity are rated as following:
★★★★★  humidity
★★★★★  temperature
★★★★  dew point
★★★  absolute humidity
★  humidity ratio
★  moisture content
★  specific humidity
  dewpoint
  dew point temperature
  water activity
  temp
  calcium chloride
  air temperature
  moisture
  atmospheric humidity
  actual humidity

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Speaking about relative humidity, one probably shouldn't forget about temperature and dew point.

Other search terms related to relative humidity and their ratings are:
★★★★★ temperature and dew point
★★ dew point
★ dry and wet bulb
★ absolute humidity
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Google Trends

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relative humidity
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