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Yep, NEMA.
I made mine airtight using grommets and black silicone goop because I didn't want any external connections to corrode. The fumes alone in a Nitric Acid plant eat just about everything but stainless.
Even the 110vac connections had to use explosion-safe hooded connections.
Inside the plant is consistently 90 degrees and up.
Of course, outdoors, I'd also use a sunshade.
You might also use 2 boxes, one for the power supply transformer which has a lot of mass and gets pretty warm, and the other box for the AP itself.
In this particular case, I had to mount a 24dB parabolic about 75ft up on a condenser tower to be able to aim at another plant facility about a mile away. I used a 100ft low-loss antenna cable and mounted the AP as close as possible to the antenna where power was available. Then I had to backhaul to the LAN with about 200ft of Cat-5. This install was the original 2mbps 802.11 DSSS, not 802.11b, but I always had full throughput bandwidth despite the long antenna run. (parabolics at both ends work quite well)
This was done in Southeastern Washington state in an area where summer temperatures are often above 100 degrees and winters frequently go well below zero. Winds gusting over 75kts are also common. (used inline lightning arrestors too) No problems with heat, wind, cold or ice...
Second implementation with shorter antenna cable runs went 2.5 miles with same performance and reliability.
By the way, the Cabletron/Enterasys APs are encased in steel boxes. The pictures you see of the products show the stylized plastic bezel used for indoor installations. Being steel, you could effectively mount a heat sink on the AP case and another on the exterior of the NEMA box, connecting them with big diameter bolts and retain the weatherproof seal while transferring some of the heat.
It may also be a good idea to add a container of dessicant in the box to guard against condensing moisture if you are in a particularly humid geographical area.
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