

It comes down to the variable weather in the US versus the UK.
The UK has maybe handful of weeks of actual hot weather, months and months of rain, and then some weeks of bitter cold. The day is more important than the month who cares if it’s March or September? It’s another day of rain and grey.
The US has extreme weather changes across the year, especially in the northeast where differences in US and UK English first began to diverge, intentionally and unintentionally. In a state like Massachusetts, knowing the month is important for things like setting the scene in letters “home” and so forth. The summer months and grossly hot. The fall/autumn is full of brilliant colors and mild weather followed by months of bitter, unrelenting cold winter. The spring months yield to green and mild weather again. Knowing that the month is April is very important because the 4th of April is going to be incredibly different from the 4th of September.
Source: Link
Osmosis Jones.
A half-and-half cartoon and live action film with Chris Rock as the titular character from the late-90s/early-00s. The movie was a flop, but I think it had more to do with lousy marketing. It was actually pretty good and a fun way to look at how things affect the human body.
David Hyde Pierce as the enormous Pill was a great choice, and Bill Murray was hilarious.