How long can the weather forecast last?

Daily forecasting can now be done in 10 days, but generally only 5 days of forecasting is highly reliable.

There are also monthly forecasts, quarterly forecasts and even annual forecasts, but first of all, it is not a daily forecast, but an estimate of the average weather conditions in a certain period: if the temperature is expected to be 0.5 degrees lower than normal next spring, the different methods determine that the long-term forecast cannot be as detailed as daily.