NOAA propagandizes that March temperatures in the US have sharply increased, and that March 2012 was the warmest on record.
CONTIGUOUS UNITED STATES Climate Summary
Both claims are false. March of 1910 was warmer and there has been no significant change in March temperatures since 1895. Four of the five warmest months of March occurred before 1950.
CRU March 2012 below
CRU March, 1910 below
They accomplished these amazing feats by adding several degrees on to recent temperatures relative to older temperatures.