How to counter Ivern
Let us take a look on how to beat Ivern. We will look at champions who are strong against Ivern and who are weak against Ivern. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Jungle champion who counters Ivern. You can already win in champion select with the right counters for Ivern. If you want to know how to counter Ivern then you need to take into account the best picks vs Ivern and the worst picks vs Ivern. This Ivern counter data is based on matches played by Pros on patch 15.9 and previous ones. It is important to see whether Pros counter picked Ivern or whether they played as Ivern.
Champions used by Pros to counter pick Ivern
Looking at the matches from Pros (see table Pros counter picked Ivern) we can see that they picked 
Naafiri most often to counter pick Ivern. The matchup Naafiri vs Ivern occured 12 times. Ivern has 7 wins and 5 losses in this matchup. Learn how to counter pick Naafiri to get another perspective on the data.
Lane outcome for Ivern
When looking at Ivern counters you will notice that win rates alone are not conclusional. Therefore we provide an overview (see table Lane Outcome) where you can see the lane outcome of Pros who played Ivern. The lane outcome of Ivern consists of three outcomes: Win, Loss or Draw. Let's take a look of Ivern lane and match outcome for specific matchups. Considering the lane outcome and the match outcome of a specific matchup, might enable you to find the right counter for Ivern.
Conclusion
Analyze the available data and learn how to beat Ivern. To master Ivern take also a look on Ivern builds and runes for Ivern. Good luck, Summoner!