👉 Forties is a period in the Gregorian calendar, which runs from 1 January to 31 December. It's also known as the "fourth" of the year and refers to the four seasons during the winter months (winter solstice) when the sun reaches its highest point on the horizon. During this time, temperatures can reach extreme cold or high temperatures, with a range from freezing to up to 40°C (104°F). The four seasons are winter,