True temperature at location? When I tested Variable thrust jet engines when used wet bulb procedures. Basically we had thermometer that we could wet cloth then spin it close to intake of engine, after minute or two the water evaporates and gives true ambient temperature at that location. On hot dry day this was important to find WOT EPR/PT7 setting based on temperature and barometric pressure. Used those numbers on chart that gave takeoff rated thrust. Based on that setting RPM, EGT, and fuel flow had to be in parameters.
As for humidity in my house runs between 46% to 51%, when A/C kicks in it bring humidity down. Air handler fan speed has lot to do with it also.
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