The sed rate test measures the distance red blood cells fall in a test tube in one hour. The farther the red blood cells have descended, the greater the inflammatory response of your immune system.
A woman pulls up her hood as she exits a subway during a snowstorm in New York City, March 5, 2015. Photo: REUTERS/Lucas Jackson. For all practical purposes, winter starts at around the moment your heating fails, forcing you to put on all your ugly Christmas sweaters at the same time. For others, itâs when you slip and fall down a dozen stairs into the subway.
The same day marks the summer solstice in the southern hemisphere. Alternatively, the spring equinox signals the beginning of spring. It is always March 20 or 21. Therefore, in the northern hemisphere, winter lasts from December 21 or 22 to March 20 or 21, about three months.