impervious to rain; keeping out or unaffected by rain: a rainproof cover; a rainproof coat.
verb (used with object)
to make rainproof.

1825–35; rain + -proof

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World English Dictionary
rainproof (ˈreɪnˌpruːf)
1.  Also: raintight (of garments, materials, buildings, etc) impermeable to rainwater
2.  (tr) to make rainproof

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Rainproof and insect proof inside, and providing good insulation from the heat
  and the cold.
The cabinet shall be rainproof with the top of the enclosure crowned to prevent
  standing water.
The disconnect switch must be mounted in the upright position and shall be
  rainproof if exposed to weather.
Install a rainproof bulletin board for announcing garden events and messages to
  keep members up to date and recruit new gardeners.
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