Final answer:
The question requires statistical analysis of historical rainfall data to determine the percentage of years with 697 mm or less monsoon rain in India. Without specific data, an exact answer cannot be provided. Factors influencing monsoon patterns include geographical features and global climate phenomena.
Step-by-step explanation:
The question 'In what percent of all years will India have 697 mm or less of monsoon rain?' involves analyzing statistical data about rainfall patterns in India. Without specific historical data or a statistical model that quantifies the percentage of years with a certain amount of rainfall, it is not possible to provide an exact answer to this question. Monsoon patterns can vary greatly from year to year in India, influenced by many factors including geographical barriers such as the Himalayas and the Western Ghats, as well as global climate phenomena.
Generally, India experiences heavy rainfall during the monsoon season, particularly along the coastal regions and areas adjacent to the Western Ghats and the Himalayas. In contrast, regions like the Thar Desert receive very little rainfall annually. To find the specific percentage of years with 697 mm or less of monsoon rain, one would need to consult longitudinal rainfall data and apply statistical analysis methods.