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4391 / Monday January 24, 2006 is supposed to be the most depressing day of the year according to a formula from a tutor at Cardiff University. His formula for the day of misery is 1/8W+(D-d) 3/8xTQ MxNA, where
W: Weather
D: Debt
d: Money due in January pay
T: Time since Christmas
Q: Time since failed quit attempt
M: General motivational levels
NA: The need to take action
4392 / Seasonal Affective Disorder, or SAD, a winter depression related to daylight hours getting shorter, was first identified in the early 1980s. SAD becomes more and more common as you head north of the equator: studies show that 1 to 2% of people in Florida suffer from the disorder, compared with more than 5% in Maryland and 10% in New Hampshire.
4393 / Vostok, Antarctica holds the record for the coldest temperature on Earth: a temperature of -129 °F / -89.4 °C was recorded on July 21, 1983. An unconfirmed report in the winter of 1997 reported an even colder temperature of -132 °F / -91 °C. This exceptionally cold weather is caused by the very high speed of the Arctic winds.
4394 / Antarctica contains 70% of the world's freshwater and 90% of the world's ice. Less than 1% of the continent is free of ice and snow.
4395 / On December 20, 2005, British swimmer Lewis Pugh broke the world record for the most Southern long distance swim. He swam 0.6 Miles / 1 km in 0°c / 32 °F water wearing only Speedo trunks, goggles and a swim cap in the freezing waters off the Antarctic peninsula.
4396 / Canadian Karlee Kosolofski holds the world record for surviving the lowest body temperature (14.16 °C). The normal body temperature of a healthy, resting human is 37.0 °C / 98.6 °F.
4397 / The largest snowflake ever recorded was 38 cm / 8 inches in diameter and was found in Montana, U.S.A. on January 28, 1887.
4398 / The highest speed recorded for a luge was 85.38 mph on May 1, 1982 in Sweden. According to the Encyclopedia of World Sport, a sled can reach a speed of up to 90 mph on a track with the right conditions.
4399/ The world record for the greatest amount of snowfall in a year is 29 m / 95 feet. It was reported at Mount Baker in Washington State, U.S.A. during the 1998-1999 ski season.
4400/ International weather data shows that 2005 was the warmest year ever in the Northern Hemisphere and the second warmest year worldwide. Temperatures in the Northern Hemisphere are about 0.4°C higher than a decade ago.
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