"Rates on 30-year fixed mortgages have been at or below 4 percent for the last eight weeks and now are almost 0.9 percentage points below where they were at the beginning of the year, which means that today's home buyers are paying over $1,200 less per year on a $200,000 loan,” Frank Nothaft, chief economist at Freddie Mac, said in a statement. “This greater affordability helped push existing home sales higher for the second consecutive month in November to an annualized pace of 4.42 million, the most since January.”

Here’s a closer look at mortgage rates for the week ending Dec. 22:

• 30-year fixed-rate mortgages: averaged 3.91 percent this week, with an average 0.7 point, beating last week’s 3.94 percent record. A year ago at this time, 30-year rates averaged 4.81 percent.
• 15-year fixed-rate mortgages: averaged 3.21 percent, with an average 0.8 point, matching last week’s all-time low. Last year at this time, the 15-year mortgage averaged 4.15 percent.
• 5-year adjustable-rate mortgages: averaged 2.85 percent this week, with an average 0.6 point, a new record after dropping from last week’s 2.86 percent average. Last year at this time, 5-year ARMs averaged 3.75 percent.
• 1-year ARMs: averaged 2.77 percent this week, with an average 0.6 point, also a new record after falling from last week’s 2.81 percent average. A year ago at this time, the 1-year ARMs averaged 3.40 percent.

Source: Freddie Mac

Source: http://realtormag.realtor.org/daily-news/2011/12/23/mortgage-rates-reach-new-record-lows