Temperature is used to select observations made within an inclusive range of atmospheric temperatures. You must uncheck Ignore to select a temperature range.
Humidity is used to select observations made within an inclusive range of relative humidity values. You must uncheck Ignore to select a humidity range.
Wind is used to select observations made within an inclusive range of wind speeds and direction. You must uncheck Ignore to select a wind speed range or wind direction.
Pressure is used to select observations made within an inclusive range of atmospheric pressure values. You must uncheck Ignore to select a pressure range.
What about?
Units of measure (English or Metric) for weather related values are set in Preferences.