In range I$20$:I$29,$ calculate the column position for the list of cities found in range G$20$:G$29.$

Place your calculation in cell I$20$ for the city in cell G$20.$

Use the MATCH function.

Reference the row labels of the lookup table $($range C$2$:O$2)$ in your formula.

Reuse your formula to complete range I$20$:I$29.$