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- When blocked by clouds or reflected off other objects, sunlight is diffused. Sources estimate a global average of between 164 watts to 340 watts per square meter over a 24-hour day; this figure is estimated by NASA to be about a quarter of Earth's average total solar irradiance.
en.wikipedia.org/wiki/Sunlight
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How much sunlight passes through a cloud?
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Do cloudy days make UV rays stronger?
Jul 3, 2020 · When compared with completely clear skies, studies have shown that partially cloudy skies have raised the UV-B rays by 25% and increased DNA damage up to 40%! So yes! Cloudy days can actually be more dangerous for your skin!
Jul 5, 2016 · The various studies have found that between 1.4 and 8 percent of all measurements show cloud enhancement compared with clear-sky values, depending on geographic location, but as many as 25 percent of those made on partly cloudy days may show it.
Sunlight takes about 8.3 minutes to reach Earth from the surface of the Sun. A photon starting at the center of the Sun and changing direction every time it encounters a charged particle would take between 10,000 and 170,000 years to get to the surface.
Yes, plants still receive some sunlight on cloudy days, although the intensity of the sunlight is significantly reduced. The amount of sunlight that reaches the ground depends on the thickness and type of clouds. Even on overcast days, some sunlight filters through the clouds and reaches the plants.
The amount of sunlight is dependent on the extent of the daytime cloud cover. Some places on Earth receive more than 4,000 hours per year of sunlight, as in the Sahara; others receive less than 2,000, as in regions of frequent storminess.
- The Editors of Encyclopaedia Britannica
Jul 25, 2016 · It varies by type of cloud, thickness, altitude, angle of the sun and likely many other factors. As a generality, clouds block a part of visible, UV and IR light depending on a number of factors especially depth of the cloud.
The highest readings occur in the four-hour period around "solar noon", which is when the sun is at its highest spot in the sky - usually from late morning to early afternoon. The UV Index (or UVI ...
