How about user configurable string? User could write any text to be shown with some special characters to include weather information.

For example %i could be weather image, %c temperature in celcius, %f in fahrenheit, %w wind speed, %d wind direction etc.

Then user coud write string in config like "%i Temp: %c Wind: %w - %d"

Just like Clock.sbar is for example... I'd love that :)