"Personal weather station" covers a lot of ground, from a simple backyard gadget to a serious instrument doing real scientific work.
Most track the essentials: temperature, humidity, barometric pressure, wind speed and direction, and rainfall. Specialized sensors take it further, lightning and UV sensors for outdoor enthusiasts, soil and leaf moisture sensors for gardeners and farmers.
Many personal stations connect straight to the internet, sharing data through networks like Weather Underground or the Ambient Weather Network, and can even trigger smart home automation. Some of that data even reaches meteorologists — the Cooperative Weather Observer Program (CWOP) feeds volunteer station readings straight to the National Weather Service, helping fill gaps where official stations don't reach.
Your backyard could be part of that bigger picture. APEXS can help you pick a personal station that punches above its size.