Newark is suburbia and then rural to its west and southwest though. When the winds are westerly or southwesterly during heatwaves, they are blowing over a lot of greenery and open space.
The Central Park station is in a mini jungle, improperly sited compared to all the other official stations surrounded by concrete.
So the conditions between these two stations are actually the opposite.
East Jersey naturally is the hottest area, probably due to some downsloping. Other personal stations in that area even in suburbia get basically as hot as Newark does, you can see them on the Ambient Weather website.