Farmers most frequently use short-range forecasts, which are predictions made between 1 and 7 days in advance. In the meantime, medium range (up to a month), long-range (up to a year), and hazardous weather forecasts for agriculture can all be extremely helpful in field activity planning. To understand and predict specific agronomic events, the measurement of the meteorological parameters involved is therefore essential.
Source: WMO (World Meteorological Organization)