winter occurs in the northern hemisphere in december, january and february.
winter occurs in the northern hemisphere in december, january and february.
when does winter occur in the northern hemisphere?
december , january and february
in the southern hemisphere, seasons are in reverse to the northern hemisphere, with summer falling in december, january, and february, and with winter falling in june, july, and august. therefore, in some southern hemisphere countries, such as australia, comoros, madagascar, bolivia, angola, french polynesia, papua new guinea, paraguay, samoa, south africa and new zealand, christmas in july or midwinter christmas events are undertaken in order to have christmas with a winter feel in common with the northern hemisphere. these countries still celebrate christmas on december 25, in their summer, like the northern hemisphere.









































section::::celebrations.:northern hemisphere.
christmas in july
orbital mechanics require that the duration of the seasons be proportional to the area of the earth's orbit swept between the solstices and equinoxes, so when the orbital eccentricity is extreme, the seasons that occur on the far side of the orbit (aphelion) can be substantially longer in duration. today, northern hemisphere fall and winter occur at closest approach (perihelion), when the earth is moving at its maximum velocity—while the opposite occurs in the southern hemisphere. as a result, in the northern hemisphere, fall and winter are slightly shorter than spring and summer—but in global terms this is balanced with them being longer below the equator. in 2006, the northern hemisphere summer was 4.66 days longer than winter, and spring was 2.9 days longer than fall due to the milankovitch cycles.
orbital eccentricity