Weatherproofing a laptop

[Joe Sumatra]

I have a laptop computer that will be turned on 24/7 on the roof of my building. Anyone know the best approach to shield this laptop from the elements? (ie, rain and heat). I live in los Angeles so it doesn't rain that much, although I'm concerned the summer heat might cook the laptop.
 
 Any ideas? I'm thinking about putting it in a cooler of some sort, but I'm not sure if there's enough ventilation. I'm also concerned about rain.
 			
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