This is their way of coping with three months of constant summer sunlight followed by another three months of winter darkness. During summers, reindeer eyes reflect most of the light through the retina and thus appear golden in color. In winters, enhanced night vision kicks in and a layer of tissue appears behind the retina making it look blue.
I beg to differ!
48degF is 8,888degC
(Fahrenheit-32)/1.8 = Celsius
http://www.metric-conversions.org/temperature/fahrenheit-to-celsius-table.htm
Except a select few scinetists noone talks absolute temperature, ever heard that the midday temps i Florida will be around 600degF on the tube?