![]() Visibility is more ambiguously defined than most other weather measures. That means that in the standard system, the unit is miles and in the metric system, the unit is kilometers. ![]() Visibility is reported in the long-distance unit of the units system chosen for your query. What are the units and range for historical cloud and visibility data? So, if appropriate, you should consider other visibility characteristics of your location in combination with raw cloud cover data. Note that the cloud cover measure does not take into account pollution or other conditions that may limit vertical visibility. The more clouds, the less able we are to see stars, planets and other objects in the sky including the sun for solar power. It tells us how much of the sky is blocked by clouds at a given time from a given location. That is, if you are looking out at other points on the Earth, the visibility measure tells you how far away objects can be and still be identifiable.Ĭloud cover tells a similar story in the vertical dimension. The visibility measure describes the horizontal opacity of the atmosphere. The two key measures, Visibility and Cloud Cover, are related in their ability to measure the visibility of the sky and the surrounding views on Earth. What cloud and visibility measures are available? Whether you are looking for cloud data to analyze solar panel performance, manage air travel, or determine the best places and nights for stargazing, a weather data service such as Visual Crossing Weather can provide cloud cover and visibility data easily using global historical reports going back to 1970. Historical cloud cover and visibility data are useful weather measures that are needed in various transportation, business, and recreational activities.
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