It’s called “seasonal lag.”
Essentially, water absorbs heat in the summer and then releases it in the winter. A similar phenomena (not necessarily water) can be seen on several other planets but perhaps most pronounced on Uranus which is basically tilted on its side, making the difference between summer and winter more severe.
The lag also varies by area, specifically those surrounded by water experiencing a longer lag. Ask any San Franciscan and they’ll tell you September and October are the warmest months, not June.
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