Yes, another "hottest" on record - this time for May 2016. According to
GISS NASA, the average for May was 0.93 °C, which is 0.07 °C above the previous hottest May, in 2014. Last month is the first time in seven months that the GISTemp monthly anomaly is less than one degree Celsius above the average from 1951-1980. This month the anomaly is the ninth highest for any month, lower than all anomalies from October last year, and lower than that for January 2007.
The average for the five months to the end of May is 1.15 °C, which is 0.29 °C higher than any previous January to May period. The previous highest was last year, which with the latest data had an anomaly of 0.86 °C.
There are now
eight in a row of "hottest months" from October 2015 to May 2016 (that is, hottest October, hottest November etc). If we could look back over the entire Holocene, it's probably more than 7,000 years since there was a similar run of hottest months on record, that is, not since the Holocene climatic optimum (it's probably hotter now than it was back then).
All of the previous months (October to April inclusive) had an anomaly more than one degree Celsius above the 1951-1980 mean. All of the previous months had an anomaly higher than any month outside of that October to April period. May this year had an anomaly of 0.93 °C, which is lower than the anomaly in January 2007 (0.96 °C.)
Below is a chart of the month of May only. Hover over the chart to see the anomaly in any May:
Figure 1 | Global mean surface temperature anomaly for the month of May only. The base period is 1951-1980.
Data source: GISS NASA