Hi Monya
The drier the air and higher the temperature the more dynamic range you will have along with musical body and lower acoustical/mechanical distortion. If you can set your room's humidity around 30-35% your doing good. Even lower humidity is better for sound but you'll need to keep an eye on wood products if it's too dry.
You'll notice when a rain storm comes through the sound gets sluggish and not as dynamic. This is when you don't want to push your amps to compensate.
Michael Green