In the opening scene Casey is skating on an outdoor pond (later revealed to be in Connecticut) wearing warm clothing and even a hat. A pond in the Northeast might be frozen between November-March. In the next scene, her teacher is suggesting she work on a physics project over the summer meaning it is around May or June.
Errors in geography
Snowplow Sam skills are: sitting and standing, marching in place, marching forward, gliding, dips, backward wiggles, swizzles, rocking horse, two-foot hops, forward skating, forward one-foot glides, and snowplow stops. The Snowplow Sam class is learning advanced skills. During the practice session, the skaters are landing axels, which are usually learned much later.