While we ended the year just below 4%, the average 30-year fixed mortgage interest rate has now risen to 4.15%. 

This is a good bit above the 12-month average of 3.98%, though still historically low in any longer term context.

It seems possible that we'll see some further increases in coming months, though I don't think rates will get up to 4.5% in 2018.  And....it's possible they will drop back down closer to 4% within the next few weeks or months.