The Edwardian lady in the articlemay be able to date a landscape to within four days, but the youngest children will begin to develop the concept of change by comparing photographs of a garden at different times of the year.
A web search on "weather sayings" will provide all the information you need on weather lore.
Using bioindicators to assess levels of pollution offers an inexpensive fieldwork technique - particularly useful for GCSE and A-level students who are required to collect primary data. The Environment Agency website lists a range of indicators and provides free downloadable resources for KS23 www.environment-agency.gov.uk (select Kids
GCSE andor A-level students could carry out a web enquiry on the impact of modern farming methods. Go to the RSPB's website www.rspb.org.uk and select "Farmers").