evidence: Juan De Nova Island, French Southern Territories Climate [...] Juan De Nova Island Climate Summary Located at an elevation of 16.68 meters (54.72 feet) above sea level, Juan De Nova Island has a Tundra climate (Classification: ET). The city’s yearly temperature is 26.9ºC (80.42ºF) and it is 4.98% higher than French Southern Territories’s averages. Juan De Nova Island typically receives about 67.39 millimeters (2.65 inches) of precipitation and has 117.54 rainy days (32.2% of the time) annually.