The summers are super hot and humid. It does get cold in the winter. It can be quite biting with the humidity. There are several months where the temperatures are in the 30s-40s and a couple weeks below that.
Because of the humidity, make sure in the summers to drink plenty of water. Bring a good insulated water bottle.
Get some comfortable shoes.
Elders: Get a washable suit and lots of golf pants.
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Serve shirts have a ventilation panel in the side of the shirt making them noticeably more breathable. Missionaries serving in hot or humid places absolutely RAVE about this feature. The most popular shirt for hot-climate missions, for sure.