Below are maps of the mean surface temperature anomaly for the past month, the past three months, and the past 12 months. Regional weather patterns, apparent on the monthly time scale, tend to disappear in averages over longer time scales. In the chart in the lower right we show the 12-month running means of the global land-ocean temperature anomalies.
Most recent one, three and 12 month mean global temperature anomaly maps, and 12-month-running mean global temperature anomaly. (Also in PDF, last modified 2016/05/14, now with GHCN version 3.3.0 and ERSST v4).
Our traditional graph of the annual and 5-year running means of the global temperature is shown on the left, and 12-month, 60-month and 132-month (to minimize the effect of the 11-year solar cycle) running means on the right. Part (b) makes clearer that global warming is continuing it did not stop in 1998.
(a) Annual and 5-year mean global surface temperature anomalies. (b) 12-month, 60-month and 132-month running means. The base period is 1951-1980 for both (a) and (b). (Also in PDF, Data through April 2016 are used for computing the means. last modified 2016/05/14, now with GHCN version 3.3.0 and ERSST v4.)
Note 1: GHCN-M version 3 replaced version 2 in GISS temperature analysis because NOAA/NCDC no longer updates version 2. (since 2011/12/15)
GHCN v3.2.2 was replaced by v3.3.0 (since 2015/06/13, See NASA GISS Updates to Analysis page for details.)