I copied someone else's that worked and pasted it into my signature, then simply changed the state and town, Here's mine:
[img]http://weathersticker.wunderground.com/weathersticker/bigwx_cond/language/www/US/NY/Hopewell_Junction.gif[/img*]
[img]http://weathersticker.wunderground.com/weathersticker/sunandmoon_both/language/www/US/NY/Hopewell_Junction.gif[/img*]
Just remove the * from the last [/img*].