The difference in air temperature between times or places; commonly used in weather forecasts and discussions about health/comfort.
朝晩の気温差が大きいので、羽織るものを持って行ってください。
Because the temperature difference between morning and evening is large, please bring something to throw on.
都会と郊外で気温差が観測されることがある。
There can be observed temperature differences between the city and suburbs.
この季節は日中と夜間の気温差が10度以上になることもある。
In this season, the temperature difference between daytime and nighttime can sometimes exceed 10 degrees.