The first day of winter season can mean various days to different individuals. When winter begins is subject to interpretation. “Meteorological winter” and “astronomical winter” are different approaches to the same term. Technical terms aside, winter’s arrival in real life is pretty easy to determine.
Beginning Winter up in 2010
The first day of winter this year is Dec. 1 from a meteorological standpoint. The winter season solstice is the 1st day of astronomical winter. On this year’s calendar, December 21st is the day. Winter did not wait for any human explanations this year. A few weeks of huge snowstorms and sub-zero temperatures had already taken place once Dec. 1 hit. La Nina is what has influenced the weather a lot this year. The equatorial Pacific has a drop in ocean temperatures when La Nina happens. La Nina brings harsh winter conditions across the northern U.S.
Two instances the first morning of winter
On December 1, meteorological winter season began when northern hemisphere entered its coldest period of average temperatures. From Nov through Jan the coldest climate is there as it’s when the shortest days are. In January, the snow pack really helps the atmosphere to stay cooler which is why the coldest part of the meteorological winter season is typically then. Dec. 21st is when the astronomical winter could be starting up. That is as the northern hemisphere can be having its shortest period of daylight. The meteorological winter days commence to end after the solstice when days get longer. The astronomical winter season will not end until March 21st, 2011. This can be when the vernal equinox happens.
Winter 2010-11 climate happening
In real life, the first day of winter season comes too early and the first morning of spring comes too late for those living within the climates most affected by climate and short daylight. Winter 2010-11 will hit hardest in the Northwest, Great Plains, Great Lakes and New England, according to accuweather.com. These regions could have snow and ice more than normal. Many want relief from this. Hopefully it happens by going south. There’s a "non-winter" forecasted some places. From California to the Southeast are these areas.
Details from
Archeoastronomy.com
archaeoastronomy.com/2011.shtml
Accuweather.com
accuweather.com/blogs/news/story/40340/accuweathercom-winter-forecast-1.asp
Wikipedia
en.wikipedia.org/wiki/Winter
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