Weather for stargazing

Cloud cover is the number that matters most: under about 20% clouds is a good night, and anything above half the sky usually means staying in. Humidity and dew risk matter for equipment, because lenses fog over when the air is close to saturation. Wind blurs the view through a telescope even on a clear night.

Look at the hourly view rather than the daily summary: clouds often clear after midnight, and a short clear window is enough for the Moon, the planets and bright stars.