Twenty years (1976 to 1995) data on incidence of brown rust disease (Puccinia recondite) of winter wheat recorded from different districts of Lublin region, Poland was analysed to find out the effect of weather parameters on disease development and its intensity. Periods were separated based on infection spread over 50% of the crops, and those where infected percentage was less than 30%. The correlation coefficients (r) between the volume of the infected wheat by Puccinia recondita and weather parameters during different phases of wheat were calculated. The results indicated a complex influence of weather conditions on the development of Puccinia recondita. The most significant effect on the scale of the infection of winter wheat was cloud cover, number of days with dew, amount of rainfall and number of days with precipitation. In the case of more than 50% of the infected plants, the most important parameters were number of days with fog, relative humidity, low humidity and cloud cover.