The weatherstation is from this manufacturer:
http://www.termometerfabrikenviking.se/index.htm but it's an older model, not shown on their website. Yes, it's wireless. I bought it a year ago for SEK 999 (about £ 90/US$ 150). Of course, I don't use all the functions such as precipitation meter and wind meter; just temperature and humidity. I'm really satisfied with it since it allows me to have constant control over the parameters. Well worth its price.
These are the values for the last 24 hours:
The temperature is the red line (the green is the dewpoint). One can see when I loaded the drying chamber with seven kilos of salami - temperature went up. The zigzag pattern is of course when the fridge turns on and off.
And the relative humidity:
It is extremely sensitive. Here is the air pressure. The spikes are when I open a window in my apartment. That makes a one millibar difference!