The 30-year, fixed-mortgage rate decreased after a stable two weeks, to new record low at 4.07%, according to the Zillow Mortgage Marketplace weekly update. Zillow said the current 15-year, fixed average rate is 3.51% and the rate for a 5-1 adjustable rate mortgage is 2.91%. That type of mortgage maintains a steady rate for five years and then is adjusted annually thereafter. Regionally, 30-year rates vary, but the majority of states witnessed a deflation. New York's average rate fell 30 basis points to 3.98% last week, down from 4.28%. Rates in Florida fell substantially also, down to 4.02% from 4.13% the previous week, California's rate decreased to 4.04% from 4.15%, and Texas saw its average rate disintegrate to 4.11% from 4.17%. Pennsylvania's current rate of 4.08% is down from 4.11% last week. Colorado's average rate for a 30-year fixed mortgage shrunk to 4.10% from 4.14% at Nov. 2. Washington's 30-year FRM increased to 4.12%. Zillow bases its averages on real-time mortgage quotes from lenders registered with the company. The national average comes from thousands of daily quotes by anonymous borrowers through the Seattle-based company's website. Write to Christine Ricciardi.