Don't know about your skies.....but for me....it depends.
Our humidity in summer runs under 20% most days. In winter it pops up to 80% plus range at night.
So if there is ANY light around like my house in town the sky becomes hazy and milky in winter due to the light scatter due to high humidity.
At my vacation home 10 miles and 3000 feet higher in elevation many times the fog layer lays below it effectively blocking ALL the lights from the small towns and Wenatchee in the area. That sky is very, very dark in spite of the higher humidities.