What is the heaven energy? If you think about it, that's all the stuff that falls on us from the sky. Lightning, rain, snow, hail... What is all of that? It's the weather.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
The weather is bad today.
The prince's mood depends on the daily weather.
The weather on my day off is cloudy.