The monthly outlook is a forecast of temperature and precipitation trends for the next three weeks. Predictions are made on average weather development, as opposed to those made on individual weather events in forecasts for the next few days.
The monthly outlook forecasts temperatures and precipitation for the coming weeks compared to the long-term average.. The diagram shows three bars indicating the probability of lower, similar or higher values than in the long-term comparison period. The outlook is updated twice a week, generally on a Tuesday and a Friday.
In contrast to weather forecasts, long-range prognoses on climatic evolution are naturally beset by a high degree of uncertainty. Nevertheless, predictions can be made with regard to average values. This is done by running model simulations on high performance computers in order to quantify the range and probability of possible climatic conditions.