DB iPad Weather Lockscreen is an awesome new lockscreen weather widget available for $1.99 on Cydia.
There isn't much point in writing too much about it, as a picture paints a thousand words...
The only thing to say is that the weather is configurable, either by using a specific Yahoo weather code, or automagically via the MyLocation app (install GPS Lockscreen Weather from Cydia to enable this feature).
The lockscreen also fully supports screen rotation from portrait to landscape. I'd also like to point out that Glasgow does not look like that when it is 3 degrees outside either