noun
weather prediction by observing sky and wind
Traditional method of forecasting weather by watching clouds, wind direction, and other natural signs, often used in outdoor activities like sailing or mountaineering.
山では観天望気が大切だ。
In the mountains, predicting the weather by observing the sky is important.
漁師は観天望気で出漁を
Fishermen sometimes decide whether to go out based on weather signs.