Relative humidity measures how much moisture is in the air compared to how much it could hold at a given temperature. It is simply the dew point temperature divided by the air temperature, times 100.
Understanding the difference between humidity and moisture.
Your home will be an escape from the humidity with these tricks.
More extremely warm conditions for mid-February are in store for Chicagoland on Wednesday, with high temperatures soaring into the mid-60s in some locations.