If there's fog, you could say that "a veil of mist obscures faraway buildings/houses". You can say how the weather makes you feel. Maybe the cloudy sky is "a melancholic shade of gray". (melancholic means "expressing pensive sadness") Maybe the clouds and the cool weather is "refreshing", or the air feels "crisp". If it's cloudy and moist outside, but also kind of hot, you can say that the weather is "humid". I can't write the page for you, but I hope the ideas help!
