This is a solar radiation shield sized to hold an arduino. This allows an arduino, and accompanying sensors, to be exposed to weather but keep it protected from rain and direct sunlight. The layers snap together using pins so it is easy to open and access the internals. White ABS should be used to prevent radiant heat buildup and UV light degrading the plastic.
Scad file is available on github https://github.com/tscofield/Solar_Radiation_shield
An arduino can be nicely held with zipties inside the shield. https://www.thingiverse.com/thing:2906954