in summer in the summer - English Grammar

in the summer  When used as an adjective, you would not use the word 'the' For example summer weather, summer temperatures, spring morning, winter snow  ให้คุณสั่งซื้อ in the summer ได้อย่างรวดเร็วในราคาสุดคุ้มจากร้านค้าชั้นนำ พร้อมบริการจัดส่งถึงมือคุณ สั่งซื้อเลยวันนี้ผ่าน Shopee Thailand

In the Self-Paced Program, high school students can explore web development, cyber security, data science, and artificial intelligence Participants work at มรสุมฤดูร้อน WordNet summer, the warmest season of the year; in the northern hemisphere it extends

The phrase 'in the summer' is correct and commonly used in English, while the phrase 'at the summer' is incorrect 'In the summer' is the In The Summer is the third single by English electronic band Crystal Fighters from their album Star of Love The single was released on 5 July 2010