The Met Office’s Weather Observations Website (WOW) is a rich source of weather data for locations in the UK and worldwide.
Here are some lesson resources which can be used in conjunction with the data:
Use WOW data to track a cold front across the UK and work out its speed.
Met Office resource looking at correlation between classroom behaviour and weather with student worksheet and answers for teachers. Note the appearance of WOW has changed a little since this resource was written, but the St Athan data can be found by typing St-Athan or 3034 into the search box