Yahooapis Weather in French

Hi,

I need to get weather forecast from Yahoo Weather service but in French,
is it possible to make? How should query look like?
For example:
http://weather.yahooapis.com/forecastrss?w=615702

I tried sth like this:
http://weather.yahooapis.com/forecastrss?w=615702&lang=fr-FR
but it doesn't work.

Thanks,
Marek