Google's Zineb posted on Google+ that this should be resolved by the end of the week. She wrote:
An Update on the Search Analytics report in Google Search console
Data have been missing in Search Analytics since November 12th.
The team is aware of it and currently working in a fix.
It should be back to normal by the end of the week.
I hope this fixes many of the issues going forward, but I am not that confident.
Forum discussion at Google+.