What is referred to by '273 celsius'?

What is referred to by 'tobago'? Which performer is associated with 'wings'? What is the first number? What is referred to by '2 4 10 16'? What is associated with: 27315 degrees c? What is associated with: 27316 degrees centigrade? Based on the clue '40 is the only reading on these 2 temperature scal...', what is the answer? What is associated with: 45967 degrees fahrenheit?