Air temperature is stable over the year at 26 °C in February and 27 °C in August. Precipitation is as high as 3,000 mm/year and mostly occurs in summer. Sea currents are south-easterly and easterly in winter and south-westerly and westerly in summer. The average surface water temperature is 26-28 °C in February and 29 °C in May. The water temperature is constant at 4.8 °C at the depths of 1,600 m and below. Salinity is 31.5-32.5 (parts per thousand) in summer and 30.0-33.0 in winter in the southern part. In the northern part, it decreases to 20-25‰ due to the inflow of fresh water from the Irrawaddy River. Tides are semidiurnal (i.e., rising twice a day) with an amplitude of up to 7.2 meters.
Question: Does salinity have a larger range in summer or winter in the south?
Answer: winter