February 2017 was 2nd warmest Tmax. 1954 is still the record holder.
2017 Map of Tmax anomalies
1954 Map of Tmax anomalies
According to the NOAA, October 2016 Tmax in the USA was 117th warmest out of 122. 122 wast warmest.
1963 was warmest. 1947, 1950, 1953 and 1938 were also warmer than 2016.
(I publish Tmax instead of Tavg because I believe much of the US warming is UHI making the evenings warmer which shows up in the Tmin)
According to the NOAA, May 2016 was ranked 49th coldest out of 122.
That is essentially a tie with May 2015. The warmest May Tmax’s were 1934, 1936, 2012 and and 1939.
The following map shows state rankings. 122 = warmest. 1 would be coldest.
Note the states ranked 7th and 8th coldest. Wow. Not much El Nino effects …