Ok let's look at what can be monitored. Wind speed, wind direction, temperature, humidity, rainfall. There are many stations that can do these basic parameters. Oregon Scientific, Davis Vantage Vue, and others are affordable if the basic are all you want. Solar, UV, leaf wetness, soil temperature. This is a more specialized station and is in the higher category (i.e. cost) which would be the Davis Vantage Pro 2+ and above. (Additional sensors can be added over time.) Decide what you want to measure out of the box and can afford and what you want to measure in the future. Make sure the station can be added on to or face the fact you will be stuck with what it has and then start all over when you want to upgrade.
Siting of your station is important. If you can place the Temp/Humidity over grass then by all means. If the station allows you to split it up, putting the rain bucket in easy reach for maintenance is good with a separate anemometer up for good wind reception is even better.
Wireless versus wired. Slow Modem makes a good point (always) in that it is good for lightning protection. Wired stations can bring the forces of nature directly to you in your home. However, there are some installations where wireless is not allowed. Oh and almost every station that uses wireless are on their own protocal which should not be confused with WiFi. I think that Slow made one typo (say it isn't so
)....he said that some stations transmit 100 to 300 and some up to 100...I think he meant that some can go up to 1000 ft. The Davis units go up to 1000 ft (less when you put walls and metal buildings and such between the station and its receiver).
Read through this and the many more when everyone else puts in their ideas and then decide..What you want to measure at start vs cost and do you want to be able to upgrade or add on later. We are here to help you
spend all your money pick out your first station and get it online.