Hello! The effects of ENSO in northern Europe tend to be less consistent than in other parts of the world. You can check out our maps showing the ENSO teleconnections here; as you'll notice, El Nino winters tend to be a bit cooler and drier than average in Sweden, but the correlation is not strong, meaning this isn't a particularly consistent effect. The UK Met Office has some information on European ENSO teleconnections, here. Interestingly, their analysis has found that weaker El Nino events are related to cooler winters over Northern Europe, but strong El Nino events have the opposite effect. So... maybe you can plan to build a few more snowmen this winter, given the likelihood of a weak El Nino?