The last 12 months have been the warmest one year period in the NASA database since records began in 1880. According to the just released NASA GISS Global Temperature Data, March, 2015 is estimated to have been the fifth warmest month on record. Here are the top 20 months in rank order:

2007 JAN 93
2002 MAR 88
2010 MAR 87
1998 FEB 86
2015 MAR 84
2010 APR 82
2014 SEP 81
2015 FEB 78
2014 MAY 78
2014 OCT 77
2005 OCT 76
2015 JAN 75
2013 NOV 75
2010 NOV 75
1998 JUN 75
1995 FEB 75
2010 FEB 74
2006 DEC 74
2014 DEC 73
2014 AUG 73

Here is the monthly data covering the entire period of the instrumental record (1880 – present)

And, most importantly, here is the 12 month running mean (showing only since 1940 to make it easier to read):

And a couple more graphics showing the last few months up close:

And this is just looking at January through March for each year in the database: