This! Not a Floridian, but my parents live there half the year, and we (well, they) have owned a home there for the past 25 years. Based on even our more limited experience, we bring clothes for every possibility. I'm usually a complete minimalist when it comes to packing, but runDisney events are an exception. In 2015, we went from super warm 80s to freezing the morning of that 5K to great weather the morning of the marathon. This is not the time to save space. And if your kids are running with you, it's DEFINITELY not the time to save space. Turns out the cold DID bother our teenage son dressed head to toe in full Elsa costume for the 5K.
@mateojr, however, was very cozy in his Kristoff costume.