Peter,
There are myriads of different options - from cheap ebay greenhouses, even a cheap garden shed if you can set it up in a 'roll away' type configuration and anchor it down in a non destructive manner may work. (it's almost an obs!).
The only suggestion i'd have would be multiple layers (ie an insulating/absorbing layer - such as removalists blankets or something, then a waterproof membrane, gathered underneath to prevent moisture getting to the electronics) ... should be fine other than that...
Jamie
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