I previously hacked together an Ikea sensor which worked well for the price, but was not weatherproof, and my solution caused the temperatures to be very inaccurate.

I'm looking for something that can be used offline (connects to HA via WiFi, Zigbee, etc but does not need WAN access) and is plug and play. I see some solutions like this, but am not sure if they will work in an 'offline' mode. Anyone have any suggestions? Something with wind speed, etc would be awesome.