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The United States adopted the conversion factor 1 metre = 39.37 inches by an act in 1866. [30] In 1893, Mendenhall ordered the physical realization of the inch to be based on the international prototype metres numbers 21 and 27, which had been received from the CGPM, together with the previously adopted conversion factor. [31]
In the United States, Canada, and Mexico, ring sizes are specified using a numerical scale with 1 ⁄ 4 steps, where whole sizes differ by 0.032 inches (0.81 mm) of internal diameter, equivalent to 0.1005 inches (2.55 mm) of internal circumference.
Snowfall was first officially recorded in 1898, and since then, accumulations of 0.1 inches (0.25 cm) or greater have occurred only eight times within city limits. The heaviest snowstorm on record took place on January 21–22, 1937, when 1 to 4 inches (2.5 to 10.2 cm) fell in parts of the city and did not melt entirely for three days.
On average, December and January have the greatest number of precipitation days. Snowfall averages 44.1 inches (112 cm) per season, but has historically ranged from 8.8 in (22 cm) in 1918–19 to 80 in (200 cm) in 1950–51. [76] There is an average of 59 clear days and 103 partly cloudy days per year, while 203 days are cloudy. [77]
For example, a length that is significantly longer or shorter than 1 metre can be represented in units that are a power of 10 or 1000 metres. This differs from many older systems in which the ratio of different units varied. For example, 12 inches is one foot, but the larger unit in the same system, the mile is not a power of 12 feet. It is ...
[95] [96] [97] The snowiest season was 1951–52, with 117.3 inches (298 cm), while the least snowy season was 16.6 inches (42 cm) in 1933–34. [98] The snowiest month on record was January 1993, in which 50.3 inches (128 cm) were recorded. [99] The nearby Great Salt Lake is a significant contributor to precipitation in the city.
The averages 42 to 49 inches of precipitation annually, with snowfall averaging 29.8 in (75.7 cm) per year but is highly variable between winter seasons. [4] The city can also be prone to strong winds, being a coastal location it is exposed to the Atlantic.
A snow event of 0.9 inches (2 cm) on February 4, 2011, caused more than 300 car crashes. [84] The most recent major snow event occurred February 14–15, 2021, when 6.4 inches (16 cm) of snow fell at Austin's Camp Mabry, the largest two-day snowfall since records began being kept in 1948. [85] [86]