October obliterated temperature records, virtually guaranteeing 2023 will be hottest year on record

A surfer rides a wave Oct. 7, in the Atlantic Ocean in Biarritz, southwestern France. October was the fifth straight month that Earth set a record for the hottest month in recorded history. (AP Photo/Bob Edme, File)

This October was the hottest on record globally, 1.7 degrees Celsius (3.1 degrees Fahrenheit) warmer than the pre-industrial average for the month — and the fifth straight month with such a mark in what will now almost certainly be the warmest year ever recorded.