Which of these Christmas songs was written in summer?

Online Answer
The song was written by Mel Tormé and Bob Wells in the summer of 1944 during a blistering heat wave. According to Time, the songwriters wrote "The Christmas Song," more popularly known as "Chestnuts Roasting on an Open Fire," in just 45 minutes.
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The Christmas Song (commonly subtitled "Chestnuts Roasting on an Open Fire" or, as it was originally subtitled, "Merry Christmas to You") is a classic Christmas song written in 1945 by Robert Wells and Mel Tormé..