>>64089867
no, water takes awhile to heat up in the spring/early summer and takes awhile to cool in the late summer/fall so the average water temp in Kherson doesn't go below 60F until mid October
https://weatherspark.com/m/97401/9/Average-Weather-in-September-in-Kherson-Ukraine#Figures-Temperature

might save a few of them but with Russia's water crossing history in this war I don't think it matters much