Based on the 5 year averages of the values of pressure, temperature and relative humidity at 700-mb level, the corresponding values of modified radio refractive index have been computed for this level over 12 Indian stations these data have been utilised to discuss the monthly and seasonal distribution of radio-refractive index at 700-mb level. Various radio-climaticcharts, dealing with the horizontal distribution of radio-refractive index at this isobaric surface over India, have been prepared and their prominent features have been discussed.