It will have an impact on the rainfall from 5th July 2016 to 19th July 2016.
On the basis of 195 days gap, the 2nd day of Garbottam will have a bearing on rainfall on 9th July from any place of observation. The rationale is this. This 2nd day of Garbottam happens on Panchami of the waning period of Margazhi. It will have an impact on the day of Panchami in the waxing period of Aani. That date is 9th July 2016.