A good way to meet local runners is to participate in a parkrun. Uppsala parkrun is in this area.
Running in a new city in the winter time can be tricky. Bad weather and darkness makes it hard to find good places to run.
For hardcore track runners who wants to workout on an indoor track; try IFU Arena.
Uppsala Friidrottsarena is a popular place to run in this area.
A bit further away you have Sunnerstaåsens friluftsområde at your disposal.