Global Analysis - July 2004
Note: The data presented in this report are preliminary. Ranks and anomalies may change as more complete data are received and processed. Effective September 2012, the GHCN-M version 3.2.0 dataset of monthly mean temperature replaced the GHCN-M version 3.1.0 monthly mean temperature dataset. Beginning with the August 2012 Global monthly State of the Climate Report, released on September 17, 2012, GHCN-M version 3.2.0 is used for NCDC climate monitoring activities, including calculation of global land surface temperature anomalies and trends. For more information about this newest version, please see the GHCN-M version 3.2.0 Technical Report.
*The GHCN-M version 3.1.0 Technical Report was revised on September 5, 2012 to accurately reflect the changes incorporated in that version. Previously that report incorrectly included discussion of changes to the Pairwise Homogeneity Algorithm (PHA). Changes to the PHA are included in version 3.2.0 and described in the version 3.2.0 Technical Report. Please see the Frequently Asked Questions to learn more about this update.
Global Highlights:
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Contents of this Section: |

| The data presented in this report are preliminary. Ranks and anomalies may change as more complete data are received and processed. The most current data may be accessed via the Global Surface Temperature Anomalies page. |
The two maps below utilize different base periods and may reflect
different anomaly values of land surface temperatures. The dot map
on the left uses anomalies that were calculated from the Global
Historical Climatology Network (GHCN) data set of land surface
stations using a 1961-1990 base period. The map on the right is a
blended product
which uses satellite and surface anomaly values of measured land
and ocean temperatures as well as SSTs with the base period of
1988-2004. Both maps reflect conditions during July 2004,
indicating above average temperatures in Alaska, the majority of
Canada, the eastern half of Russia and Saudi Arabia, with cooler
than average temperatures in the Great Plains of the US, parts of
southern Australia, Mali and southern Brazil. |
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Current Month / Year-to-date
|
| July | Anomaly | Rank | Warmest Year on Record |
|---|---|---|---|
| Global Land Ocean Land and Ocean |
+0.46°C (+0.83°F) +0.38°C (+0.68°F) +0.40°C (+0.72°F) |
7th warmest 4th warmest 6th warmest |
1998
(+0.98°C/1.76°F) 1998 (+0.52°C/0.94°F) 1998 (+0.66°C/1.19°F) |
| Northern Hemisphere Land Ocean Land and Ocean |
+0.49°C (+0.88°F) +0.53°C (+0.95°F) +0.51°C (+0.92°F) |
10th warmest 2nd warmest 5th warmest |
2002
(+0.93°C/1.67°F) 1998 (+0.57°C/1.03°F) 1998 (+0.70°C/1.26°F) |
| Southern Hemisphere Land Ocean Land and Ocean |
+0.36°C (+0.65°F) +0.28°C (+0.50°F) +0.29°C (+0.52°F) |
17th warmest 10th warmest 11th warmest |
1998
(+1.15°C/2.07°F) 1998 (+0.50°C/1.00°F) 1998 (+0.62°C/1.12°F) |
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The most current data may be accessed via the Global Surface Temperature Anomalies page.
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The satellite images below were acquired from SSM/I satellite data using a base period of 1988-2004. The map on the left reflects surface liquid wetness conditions, while the map on the right reflects snow cover conditions for the month. Snow covered areas that are normally snow-free during this month will appear drier than average on the wetness image since a wetness value cannot be determined for regions that are snow covered. Data in these areas that are normally snow covered are displayed as missing. This is due to the snow crystalline structure which produces a considerable amount of scatter and makes it difficult for the SSM/I to accurately detect the surface conditions. The SSM/I products are experimental and are under continuing review and development. Additional data and information can be found on the SSM/I Browser. |
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- Images of sea surface temperature conditions are available for
all months to date during 2004
at the weekly SST page
References:Peterson, T.C. and R.S. Vose, 1997: An Overview of the Global Historical Climatology Network Database. Bull. Amer. Meteorol. Soc., 78, 2837-2849.
Citing This Report
NOAA National Climatic Data Center, State of the Climate: Global Analysis for July 2004, published online August 2004, retrieved on May 22, 2013 from http://www.ncdc.noaa.gov/sotc/global/2004/7.














