Bucharest has a humid continental climate (''Dfa/Dfb'' by the 0 °C isotherm), or a humid subtropical climate (Köppen: ''Cfa'' by the -3 °C isotherm), with hot, humid summers and cold, snowy winters. Owing to its position on the Romanian Plain, the city's winters can get windy, though some of the winds are mitigated due to urbanisation. Winter temperatures often dip below , sometimes even to . In summer, the average temperature is  (the average for July and August). Temperatures frequently reach  in midsummer in the city centre. Although average precipitation and humidity during summer are low, occasional heavy storms occur. During spring and autumn, daytime temperatures vary between , and precipitation during spring tends to be higher than in summer, with more frequent yet milder periods of rain.