So I found a mistake on the wunderground site:
https://twitter.com/benoit__allard/status/1188425266160394240
And I looked around If I could fix it.
- data is correct (all points have a correct UTC timestamp).
- d3 is being used.
- The data is always showed in the "proper" timezone (the one of the station, not the local one).
I believe I succeeded. Tell me if you think otherwise.