Kocaeli has a moderate climate nearby the Black Sea shores and severe weather in the mountains. Let us say Kocaeli’s weather is like a shift between the Marmara Sea and the Black Sea climates, The city center is hot and a little bit rainy in summer and mostly cold, rainy, and snowy in winter, The average annual rainfall exceeds 1000 ml on the Black Sea shores, while it falls towards the south, reaching about 800 ml (784.6 ml) in Izmit, The average annual temperature is 14.8°C. The highest air temperature was 41.6°C in the city center on 11th August 1970, while the lowest air temperature was - 8.7 on 4th February 1960.