Cloud cover Cloud cover Cloud cover (also known as cloudiness, cloudage, or cloud amount) refers to the fraction of the sky obscured by clouds when observed from a particular location. Okta is the usual unit of measurement of the cloud cover. The cloud cover is correlated to the sunshine duration as the least cloudy locales are the sunniest ones while the cloudiest areas are the least sunny places. The global cloud cover averages around 0.68 when analyzing clouds with optical depth larger than 0.1. This value is lower (0.56) when considering clouds with an optical depth larger than 2, and higher when
Hong Kong units of measurement measurement follows the international system. Gregorian calendar is usually used, but the Chinese calendar also plays a very important role in everyday life and in telling the dates of traditional festivals. In the following table, multiple Chinese names are listed in the order of usage frequency. The kilojoule or kilocalorie is the unit used for the measurement of energy in food. The British thermal unit (BTU) is still used to measure the output of air conditioners. Horsepower (馬力) is still the dominant measurement for the power of cars . The Chinese counting word 匹 ("pat") is the unit to describe