The battery lasted through the night, and it's still alive and transmitting.

There were some humidity readings that seemed high this moring; I went to check for moisture in the enclosure but didn't see any.

My readings were higher than the weather.gov readings for my area, but I'm near a boundary of the area, so I'm not sure how that affects things. I'd like to start keeping a notebook of outdoor electronics projects to learn how to build more durable, sustainable systems.