Are the locks weather resistant or weatherproof?

Yes.

All Decibel locks (except for the SL2001 Mini and SL7001 Travel Safe) are weather resistant for outdoor use in all weather conditions. They are not water proof or IPSEC rated.

In very extreme conditions and/or extremely wet environments: Protect your Decibel device by placing it in a sheltered location or wrapping a clear plastic bag around the main unit. This will help improve battery life and reliability.