It's possible to place the beacons outdoors as they’re splashproof and dustproof. Keep in mind, though, that they're not 100% waterproof and we don't recommend exposing them to the heavy rain or other extreme conditions. If water gets under the adhesive backing, it can destroy the PCB of a beacon, effectively bricking the device. Also, heavy rain can affect signal propagation.
Because of that, consider placing a beacon under a roof or in another place where it won't be exposed to a heavy rain. An alternative would be to get some custom case to protect a device. Make sure the material it's made of doesn't affect the Bluetooth signal in any way as it would deteriorate the reliability of your use case. If you're interested in our best practices for placing beacons, check out this article.
Optimal operating temperature for the battery is 23°C (73°F). Extreme temperatures - over 60°C (140°F) or below -10°C (14°F) can reduce battery life. We didn't test beacons in those extreme temperatures so can't guarantee that our devices will work properly. If you have tried, we would love to hear about your experience, let us know!