cooler period (May–November), with temperatures rarely rising above . The temperature and rainfall range from and on Tongatapu in the south to and on the more northerly islands closer to the Equator. The average wettest period is around March with on average . The average daily humidity is 80%. The highest temperature recorded in Tonga was on 11 February 1979 in Vava'u. The coldest temperature recorded in Tonga was on 8 September 1994 in Fua'amotu. Temperatures of or lower are usually measured in the dry season and are more frequent in southern Tonga than in the northern islands. The tropical cyclone season currently runs from 1 November to 30 April, though tropical cyclones can form and affect Tonga outside of the season. According to the WorldRiskReport 2021, Tonga ranks third among the countries with the highest disaster risk worldwide – mainly due to the country's exposure to multiple natural hazards. Ecology Tonga contains the Tongan tropical moist forests terrestrial ecoregion. In Tonga, dating back to Tongan legend, flying bats are considered sacred and are the property of the monarchy. Thus, they are protected and cannot be harmed or hunted. As a result, flying fox bats have thrived in many of the islands of Tonga. The bird life of Tonga includes a total of 73 species, of which two are endemic; the Tongan whistler and the Tongan megapode. Five species have been introduced by humans, and eight are rare or accidental. Seven species are globally threatened. Economy Tonga's economy is characterised by a large nonmonetary sector and a heavy dependence on remittances from the half of the country's population who live abroad (chiefly in Australia, New Zealand, and the United States). The royal family and the nobles dominate and largely own the monetary sector of the economy – particularly the telecommunications and satellite services. Tonga was named the sixth-most corrupt country in the world by Forbes magazine in 2008. Tonga was ranked the 165th-safest investment destination in the world in the March 2011 Euromoney Country Risk rankings. The manufacturing sector consists of handicrafts and a few other very small-scale industries, which contribute only about 3% of GDP. Commercial business activities also are inconspicuous, and to a large extent, are dominated by the same large trading companies found throughout the South Pacific. In September 1974, the country's first commercial trading bank, the Bank of Tonga, opened. Tonga's development plans emphasise a growing