The warmest region in Poland is Lower Silesia (Lower Silesian Voivodeship) in the southwest of the country, where temperatures in the summer average between  but can go as high as  on some days in the warmest months of July and August. The warmest cities in Poland are Tarnów in Lesser Poland, and Wrocław in Lower Silesia. The average temperatures in Wrocław are  in the summer and  in the winter, but Tarnów has the longest summer in all of Poland, which lasts for 115 days, from mid-May to mid-September. The coldest region of Poland is in the northeast, around the area of Suwałki within the Podlaskie Voivodeship, where the climate is affected by cold fronts coming from Scandinavia and Siberia. The average temperature in the winter in Podlaskie ranges from . The biggest impact of the oceanic climate is observed in Świnoujście and Baltic Sea seashore area from Police to Słupsk.