Answer:
El cielo está nublado y gris, y hace frío. Hace mal tiempo.
Explanation:
El cielo está nublado y gris, y hace frío. Hace mal tiempo. This means there's bad weather. Nublado is an adjective that means cloudy. Gris means gray. The expression "hace frío" means it's cold. The whole phrase in English is: the sky is cloudy and gray and it's cold.
"Hace buen tiempo", is the opposite: good weather. The sky should be clear and sunny. In Spanish it would be "el cielo está despejado y soleado".
