The weather can be a little surprising based on the area served in and the time of year. It is EXTREMELY HOT in the summer- dry heat, and it can get cold in the winter.
Some of the favorite Pday activities are: visiting Tombstone and Bisbee, pickleball, exploring caves and mountains, and hiking to the Mexican border.
A camelback is nice for biking in the heat.
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People serving in hot missions highly recommend a hydration backpack. CamelBak is the brand mentioned most, but there are plenty of lower-cost options as well.
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.