Humidity plays a big role in the quality of your night sky observations beyond just dew formation. High moisture levels scatter light, reducing contrast and sometimes creating a hazy glow around bright stars and planets.
Dry air usually means clearer skies with sharper views and better contrast, making it easier to capture detailed astrophotos. Conversely, high humidity can signal unstable air masses that degrade seeing quality, causing stars to twinkle more and images to blur.
Monitoring humidity trends helps you choose the best nights and adjust your setup for optimal imaging conditions.