Question

there is a no major change in annual range of temperature of chennai

Answer 1

the nearest places from sea, have normal temprature range instead of other places in all time. hence, these places are not more cold in winter & are not more hot in summer. thus, these places have normal or lowest temprature range.
since, chennai is nearest then lucknow from sea . so, chennai have a lower annual range temprature thrn lucknow.