Looks like The Batman: Part II will take place, at least in part, during wintertime.
Director/co-writer Matt Reeves posted behind-the-scenes images to X on Thursday with the hashtag #SnowTires and a bat emoji next to it.
The post (seen below) reveals the Batmobile driving during a snowstorm. Reeves confirmed in a subsequent response to a fan that these shots are from camera tests for The Batman: Part II.
Reeves also sparked fan speculation about the sequel by sharing a fan’s post of a comic book image of Batman in the snow, an image that comes from the cover of Batman (Vol. 3) #57 that was published in 2018. The cover was illustrated by Tony S. Daniel and Tomeu Morey.
Written by Tom King, Batman #57 featured the Dark Knight battling the Russian assassin known as the KGBeast. But a Bat-film set during the winter obviously makes fans wonder if Mister Freeze will be in The Batman: Part II.

