How to counter Aphelios
Let us take a look on how to beat Aphelios. We will look at champions who are strong against Aphelios and who are weak against Aphelios. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Adc champion who counters Aphelios. You can already win in champion select with the right counters for Aphelios. If you want to know how to counter Aphelios then you need to take into account the best picks vs Aphelios and the worst picks vs Aphelios. This Aphelios 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 Aphelios or whether they played as Aphelios.
Champions used by Pros to counter pick Aphelios
Looking at the matches from Pros (see table Pros counter picked Aphelios) we can see that they picked 
Kai'Sa most often to counter pick Aphelios. The matchup Kai'Sa vs Aphelios occured 28 times. Aphelios has 13 wins and 15 losses in this matchup. Learn how to counter pick Kai'Sa to get another perspective on the data.
Lane outcome for Aphelios
When looking at Aphelios 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 Aphelios. The lane outcome of Aphelios consists of three outcomes: Win, Loss or Draw. Let's take a look of Aphelios 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 Aphelios.
Conclusion
Analyze the available data and learn how to beat Aphelios. To master Aphelios take also a look on Aphelios builds and runes for Aphelios. Good luck, Summoner!