According to
GISS NASA, the average global surface temperature anomaly for June was 0.79 °C, which just pipped June 2015 (0.78 C) and June 1998 (0.77 °C). Last month is only the second time in nine months that the GISTemp monthly anomaly is less than one degree Celsius above the average from 1951-1980. It probably won't be the last, now that El Nino is over.
The average for the
six months to the end of June is 1.09 °C, which is 0.28 °C higher than any previous January to June period. The previous highest was last year, which with the latest data had an anomaly of 0.81 °C.
There are now
nine in a row of "hottest months" from October 2015 to June 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).
Each of the previous months except May and June this year (that is, from 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.
Below is a chart of the month of June only. Hover over the chart to see the anomaly in any June:
Figure 1 | Global mean surface temperature anomaly for the month of June only. The base period is 1951-1980.
Data source: GISS NASA