I've had the Netatmo Weather for a few months now and have really enjoyed it. I even added an indoor module to track the bedroom. I did have some issues with the outdoor module though. Specifically because it can't be exposed directly to rain, which makes placement somewhat difficult at our current home. I had it set on the ledge of a northern facing window, but it would show unreasonably high humidity anytime it rained. I tried raising it off the ledge, but the problem persisted.
I had been looking at a few weather sensor shields online for a while, but none were confirmed to fit the Netatmo outdoor sensor. While lurking around Amazon one night, I noticed that there was a used La Crosse 925-1418 for a few dollars off. I gambled on it and lucked out.
It fits great without any need for modification. I mounted it to a fence post near the original location. It gets a little direct sun in the late afternoon, but I don't get massive temperature spikes. Most importantly it stays completely dry. My humidity readings have returned to sane levels as well.