Narrated Anas bin Malik: The Prophet used to offer the prayer earlier if it was very cold; and if it was very hot he used to delay the prayer, i.e. the Jumua prayer.
Hadith ReferenceSahih Bukhari / The Book of Al-Jumuah (Friday) / Hadith: 906
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة