Raw, raw day: the actual value
Histogram: the frequency (integer).
Note that "Interpolated histogram" (sic) doesn't have a single value for the vertical because it's dependent on the width of the slice, but it could express values in "frequency per unit", eg. if you have 20 "per 1 degree C" you'd understand that if you're looking at it as a 2 degree C chunk it would mean 40.
Raw, raw day: the actual value Histogram: the frequency (integer).
Note that "Interpolated histogram" (sic) doesn't have a single value for the vertical because it's dependent on the width of the slice, but it could express values in "frequency per unit", eg. if you have 20 "per 1 degree C" you'd understand that if you're looking at it as a 2 degree C chunk it would mean 40.