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We say "天気は晴れ/曇り/雨/です。", but we never say "天気は21℃です。".Use the phrase "気温は/が"気温は、21℃です。I added the following sentence on August 5 2022.We never say "天気は暑い/寒い or 気温は暑い/寒い", we say "今日は暑い/寒い
We say "天気は晴れ/曇り/雨/です。", but we never say "天気は21℃です。".Use the phrase "気温は/が"気温は、21℃です。I added the following sentence on August 5 2022.We never say "天気は暑い/寒い or 気温は暑い/寒い", we say "今日は暑い/寒い