Weatherproofing is the set of design measures that help electronics keep working when exposed to moisture, dust, sunlight, wind, and temperature swings. It can include sealed enclosures, gaskets, conformal coatings, drainage paths, corrosion-resistant materials, and thermal management. The goal is not to make a device invulnerable, but to reduce the chance that the environment causes failure.
In cyber security, weatherproofing matters because many real-world systems are physical as well as digital: outdoor cameras, access controllers, sensors, routers, and embedded devices often fail first through the enclosure, not the software. Poor sealing can lead to shorts, sensor drift, or intermittent resets that create downtime and open opportunities for tampering. Defenders use weatherproofing as part of hardening and reliability testing, checking whether a device can tolerate rain ingress, condensation, heat cycling, and dust buildup without losing function or exposing sensitive components.