This is simply because U.S is a large country with vastly different landscapes. New England states in the North, have rough winters so weather stations are built to depict the most accurate estimate of the freezing temperatures. Southern states in the South have rough summers and high levels of humidity so stations are built to depict those numbers.
Explanation:
To calculate the total magnification , of the binocular microscope -
The image of the object under observation only go via only one ocular and then travel to both our eyes ,
And the arrangement of lenses of the binocular is in way , that they are kept side - by - side and are not in a proper alignment with each other .