correcting range mapping for sky observation

No clouds = point at zero and no error bar
Clear = point at 5% with error bars going from zero to 10%
Isolated = point at 17.5% with error bars going from 10% to 25%
Scattered = point at 37.5% and error bars going from 25% to 50%
Broken = point at 70% and error bars going from 50% to 90%
Overcast = point at 95% and error bars going from 90% to 100%

For Cloud Cover for early dates there is no Isolated and
Scattered = point at 30% with error bars going from 10% to 50%
all the others are the same.