The outdoor.cases from case specialist B&W International from Germany were developed for the toughest outdoor employment and were tested under the most extreme conditions. They are designed for temperatures ranging from -40°C to +80°C.
Outdoor.cases are absolutely watertight, dustproof and airtight.
In short, they are "outdoor proof" and carry an Unlimited Lifetime Guarantee. As for your equipment, it will find all the protection it needs when secured inside an outdoor.cases.