Keeping your home’s humidity in the 40% to 60% range could make it harder for flu viruses to spread.

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.

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.