December solstice

The December solstice, also known as the southern solstice, is the solstice that occurs each December – typically on 21 December, but may vary by one day in either direction according to the Gregorian calendar. In the Northern Hemisphere, the December solstice is the winter solstice (the day with the shortest period of daylight), whilst in the Southern Hemisphere it is the summer solstice (the day with the longest period of daylight).

UT date and time of
equinoxes and solstices on Earth
event equinox solstice equinox solstice
month March June September December
year daytime daytime daytime daytime
2019 2021:582115:542307:502204:19
2020 2003:502021:432213:312110:03
2021 2009:372103:322219:212115:59
2022 2015:332109:142301:042121:48
2023 2021:252114:582306:502203:28
2024 2003:072020:512212:442109:20
2025 2009:022102:422218:202115:03
2026 2014:462108:252300:062120:50
2027 2020:252114:112306:022202:43
2028 2002:172020:022211:452108:20
2029 2008:012101:482217:372114:14

The solstice also marks the changing of seasons in many countries. 21 December is the first day of winter (in the Northern Hemisphere) and the first day of summer (in the Southern Hemisphere).

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