You can access Wendy's up-to-the-minute data either by subscribing or via a pay-as-you-call service:
You can get up-to-the-minute weather on this site by subscribing. You can then:
If you don't wish to subscribe, anyone can get up-to-the-minute data on our
public access system (calls cost 50p/min).
See the epic days you made the most of - or missed - Wendy Windblows has an extensive archive of free historical data.