Global Temperature

Makiko Sato will be on vacation Dec. 3-21. There will be no updates during this time period.

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 2015/11/16, now with GHCN version 3.3.0 and ERSST v4).

The figure below shows 60-month (5-year) and 132-month (11-year to minimize the effect of the solar cycle) running means of the surface temperature deviation from the 1951-1980 mean. This graph makes clear that global warming is continuing — it did not stop in 1998. The year 1998 was remarkably warm relative to the underlying trend line in association with the "El Nino of the century".

(a) Annual and 5-year mean global surface temperature anomalies. The last data (open square) is the Jan-Oct 2015 mean. (b) 60-month and 132-month running means. The base period is 1951-1980 for both (a) and (b). (Also in PDF, Data through October 2015 are used for computing the means. last modified 2015/11/16, now with GHCN version 3.3.0 and ERSST v4.)

Additional figures are on More Figures page.
Information in detail with tables and the original data sources are on NASA GISS temperature web pages.

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.)

Note 2: Ocean data were switched from HadISST1 + OI SST to ERSST. (since 2013/01/15)
Ocean data were switched again from ERSST v3b to ERSST v4. (since 2015/07/15, corrected on 2015/07/19)

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