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When the UV index is presented on a daily basis, it represents UV intensity around the sun's highest point in the day, called solar noon, halfway between sunrise and sunset. This typically occurs between 11:30 and 12:30, or between 12:30 and 13:30 in areas where daylight saving time is being observed.
The highest natural ground surface temperature ever recorded may have been an alleged reading of 93.9 °C (201.0 °F) at Furnace Creek, California, United States, on 15 July 1972. [7] In 2011, a ground temperature of 84 °C (183.2 °F) was recorded in Port Sudan, Sudan. [8] The theoretical maximum possible ground surface temperature has been ...
[43] [failed verification] UVC is the highest-energy, most-dangerous type of ultraviolet radiation, and causes adverse effects that can variously be mutagenic or carcinogenic. [44] Despite the importance of the sun to vitamin D synthesis, it is prudent to limit the exposure of skin to UV radiation from sunlight [45] and from tanning beds. [46]
Over time, tans and sunburns can raise the risk of developing mutations in skin cell DNA that can lead to skin cancer. “The more times you get sunburned, the higher your risk,” Elizabeth Bahar ...
Ultraviolet (UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and ...
The time of day. In most locations, the sun's rays are strongest between approximately 10 am and 4 pm daylight saving time. [19] Cloud cover. Clouds partially block UV, but even on an overcast day, a significant percentage of the sun's damaging UV radiation can pass through clouds. [20] [21]
[a] The all-time lowest recorded temperature in Phoenix was 16 °F (−9 °C) on January 7, 1913, while the coldest daily high temperature ever recorded was 36 °F (2 °C) on December 10, 1898. The longest continuous stretch without a day of frost in Phoenix was nearly eight years, from December 27, 1990, to December 23, 1998. [6]
With the exception of Madrid, [9] Lisbon [10] and Athens, [11] Rome has the highest UV index between European capitals (only in the continent) and values close to that of Chicago at 41.9 °N as ultraviolet radiation is less interfered with by other geographic variables, but with a moderate annual average with index equal to 5, which allows ...