How to foretell at least one growing season (90 days) ahead, and sometimes two full seasons (180 days), what the main features of the weather will be, with accuracy of about 90% and for the greater part, get it right too. For many years David has collected weather lore and ancient records and compilations of weather observations to enable him to become the foremost authority on nature based forecasting. Here you too can become an expert on producing detailed weather forecasts using the data you can collect yourself.