Summary:

The paper presents results of air temperature measurements carried out in 2012 using automatic weather stations in three locations. The first station records thermal conditions in the center of Bydgoszcz, the second is installed in the periphery area of the city - in Fordon, and the third station represents the rural area surrounding Bydgoszcz works in the Research Station of the Faculty of Agriculture and Biotechnology, UTP in Mochle. Based on the comparison of temperature records it was found that the highest temperature was registered in the city center, slightly cooler was in the periphery area, and the coldest was outside the city in the rural area. The largest differences were recorded in the summer, and the lowest in the winter. Identified differences in air temperature between the center of the city, peripheral zone and rural area, affected the dates of the beginning, the end and the length of meteorological seasons, the thermal vegetation period and also the attendance of days in terms of thermal conditions. The biggest discrepancies related to the city center and rural area. In Fordon usually were recorded dates in between and intermediate values. In all the locations were found similar number of warm days, the number of days with frost was the largest in the city center, and the number of ice days was by far the largest in the rural area.