Does Vernier sell a weather station?

Yes, Vernier sells the Davis weather stations. These are an excellent choice for schools. You can find more information at
http://www.vernier.com/weather

If you wanted to use Vernier equipment, you could monitor temperature, air pressure, relative humidity, UVA, UVB and light level. We have not done anything with wind speed, wind direction, or rainfall. Note that the Davis equipment is bttter suited to be left outdoors for long periods of time.