1. A method for determining combined data of weather radars in an overlap region of the observation regions of at least two weather radars, use being made of a two- or three-dimensional spatial grid for each of the measuring points in the overlap region, characterized in that polarimetric weather radars are used as weather radars, and initially a radar echo classification is respectively calculated for each measuring point of the spatial grid from the measurements of each individual polarimetric weather radar, a plurality of radar_echo classifications of the individual weather radar thereby being present for each measuring point, and in that a common weighting factor w i is then calculated for each radar echo classification from individual weighting factors w ij that result for each individual polarimetric weather radar and for each individual radar echo classification, a function of the common weighting factor w i being adopted in dependence on the individual weighting factors w ij , where w i =fkt(w i1 , w i2 ,. .. , w iM ), i corresponding to the integer number of the radar echo classification and j corresponding to the integer number of a weather radar for a total number of M weather radars.