Which Month had The Greatest Rainfall?

Month                                  Cumulative Rainfall (inches)
January                                2.7
February                                              4.7
March                                   6.4
April                                       7.0
May                                       7.6
June                                      14.1
July                                        35.1
August                                  52.1
September                         67.1
October                                               70.2
November                          70.3
December                           70.8
The table shows the cumulative rainfall by month for one year for Delhi, India. Which month had the greatest rainfall?

1. December
2. October
3. July
4. August