Meteorological winter is the method of measuring the winter season used by meteorologists based on "sensible weather patterns" for record keeping purposes,[1] so the start of meteorological winter can change depending on how far north one lives.[2] Winter is often defined by meteorologists to be the three calendar months with the lowest average temperatures. This corresponds to the months of December, January and February in the Northern Hemisphere, and June, July and August in the Southern Hemisphere. The coldest average temperatures of the season are typically experienced in January or February in the Northern hemisphere and in June, July or August in the Southern hemisphere. Nighttime predominates in the winter season, and in some regions winter has the highest rate of precipitation as well as prolonged dampness because of permanent snow cover or high precipitation rates coupled with low temperatures, precluding evaporation. Blizzards often develop and cause many transportation delays. Diamond dust, also known as ice needles or ice crystals, forms at temperatures approaching −40 °F (−40 °C) due to air with slightly higher moisture from aloft mixing with colder, surface based air.[3] They are made of simple ice crystals that are hexagonal in shape.[4]
Accumulations of snow and ice are commonly associated with winter in the Northern Hemisphere, due to the large land masses there. In the Southern Hemisphere, the more maritime climate and the relative lack of land south of 40°S makes the winters milder; thus, snow and ice are less common in inhabited regions of the Southern Hemisphere. In this region, snow occurs every year in elevated regions such as the Andes, the Great Dividing Range in Australia, and the mountains of New Zealand, and also occurs in the southerly Patagonia region of South America. Snow occurs year-round in Antarctica.
Meteorological winter is the method of measuring the winter season used by meteorologists based on "sensible weather patterns" for record keeping purposes,[1] so the start of meteorological winter can change depending on how far north one lives.[2] Winter is often defined by meteorologists to be the three calendar months with the lowest average temperatures. This corresponds to the months of December, January and February in the Northern Hemisphere, and June, July and August in the Southern Hemisphere. The coldest average temperatures of the season are typically experienced in January or February in the Northern hemisphere and in June, July or August in the Southern hemisphere. Nighttime predominates in the winter season, and in some regions winter has the highest rate of precipitation as well as prolonged dampness because of permanent snow cover or high precipitation rates coupled with low temperatures, precluding evaporation. Blizzards often develop and cause many transportation delays. Diamond dust, also known as ice needles or ice crystals, forms at temperatures approaching −40 °F (−40 °C) due to air with slightly higher moisture from aloft mixing with colder, surface based air.[3] They are made of simple ice crystals that are hexagonal in shape.[4]Accumulations หิมะและน้ำแข็งมักเกี่ยวข้องกับฤดูหนาวในซีกโลกเหนือ เนื่องจากมวลชนแผ่นดินขนาดใหญ่มี ในซีกโลกใต้ สภาพภูมิอากาศทางทะเลมากขึ้น และขาดญาติที่ดินจาก 40 ° S ทำให้หนาวพะแนง ดังนั้น หิมะและน้ำแข็งได้น้อยทั่วไปในภูมิภาคที่อยู่อาศัยของซีกโลกใต้ ในภูมิภาคนี้ หิมะเกิดขึ้นทุกปีในพื้นที่สูงเช่นอังเดส ช่วงแบ่งดีในออสเตรเลีย และภูเขาของนิวซีแลนด์ และยัง เกิดขึ้นในภูมิภาคแทสมาเนียล่องของอเมริกาใต้ หิมะเกิดขึ้นตลอดทั้งปีในทวีปแอนตาร์กติกา
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