Winter is here
Winter is the coldest season of the year in polar climates and temperate climates, between autumn and spring. Winter is caused by the axis of the Earth in that hemisphere being oriented away from the Sun. Different cultures define different dates as the start of winter, and some use a definition based on weather. When it is winter in the Northern Hemisphere it is summer in the Southern Hemisphere, and vice versa.
The moment of winter solstice is when the sun's elevation with respect to the North or South Pole is at its most negative value. The earliest sunset and latest sunrise dates outside the polar regions differ from the date of the winter solstice, however, and these depend on latitude, due to the variation in the solar day throughout the year caused by the Earth's elliptical orbit.
4 Wintertime fun facts
- A single snowstorm can drop 40 millions tons of snow.
- We will have a cold winter if larger numbers of spiders are seen in autumn.
- Hailstones are built like onions.
- The world's biggest snowflake fell on January 28, 1887, in Ft. Keogh, Montana. It was 15 inches across and 8 inches thick.