St. Croix Temperature At St. Croix in US Virgin Islands, for a period of record spanning 1972 – 2014 average annual 2m air temperature = 27.2 °C warmest year on record = 28 °C in 1998 coldest year on record = 26.1°C in 1979 warmest month on average = 28.7 °C in August warmest month …