Hai Duong's climate is characterized by mild winters with temperatures ranging from 8-25°C in January, gradually warming up to 28-33°C in April. Summer months of May to August bring scorching heat, with temperatures often soaring above 35°C, while September and October see a slight cooling trend before the arrival of winter's chill. November marks the beginning of cooler temperatures, averaging around 15-31°C, before dropping to as low as 11-27°C in December. The temperature fluctuations are relatively moderate throughout the year, with no extreme cold or hot periods. Overall, Hai Duong enjoys a subtropical climate with mild winters and warm summers.