From NOAA, discussing the 12 months to March 2015 (for California) and the first 3 months of 2015.

West saw record warm start to year, Northeast saw record cold, NOAA says - The Washington Post

"...On the whole, though, the warmth won across the United States in March, which was the 12th warmest March on record for the lower 48 states at 3.9 degrees above the 20th-century average. The period from January to March was the 24th warmest on record, at 2 degrees above average."