June is another fascinating month to visit Hawaii with average temperatures in the comfortable 73°F (22.8°C) to 82°F (27.8°C) range. Trade winds flow from the area of high pressure, the North Pacific High, which lies in the north and east of Hawaii during the summer and forms a ventilation system with mild temperatures around the islands. As such, the north and east coasts have mild average temperatures of 68°F (20°C) to 82°F (27.8°C) and draw many tourists in the dry season. The reefs have calm and clear waters with the average sea temperature of 74°F (23.3°C), which creates interest in snorkeling and scuba diving activities. Night temperatures nearby the ocean hardly vary; 2 to 4 degrees compared to the daytime temperatures, which sees the tourists gazing at the stars in cloudless skies after sunset. The amount of sunshine is excellent throughout the year, especially in the leeward areas; Hawaii receives an average of 10 hours of brilliant sunshine in June.