Don't ask me, how they convert Celsius and Fahrenheit. but the converter from ERX is great to be able to get the right temp.
What I just know is that when the Fahrenheit guys are out in 90 degrees, this would be in Europe perfect for the sauna!
We use http://www.wetteronline.de
Windfinder is really good, and you can send yourself SMS with the average windspeed from your local spot of the past our to your celuar. Good forecast, IMO better than wetteronline. Also good for swell forecast.
Have a look at it, you will like it.