The city has cold, sometimes snowy, cloudy winters, and warm, relatively sunny but frequently stormy summers. Spring and autumn can be unpredictable, highly prone to sudden weather changes; however, temperatures are usually mild, especially around May and September. The daily average temperature ranges between  in January and  in July and the mean year temperature is . Temperatures may reach  in the summer, although the effects of hot weather are usually offset by relatively low dew points and large diurnal temperature differences. Warsaw is Europe's sixth driest major city (third in Eastern Europe), with yearly rainfall averaging , the wettest month being July. 