Global Analysis - August 2004


Global Highlights:

  • Based on preliminary data, global average combined land and sea surface temperature was sixth warmest on record for both August and June-August 2004
  • June-August temperatures were above average throughout Europe, Alaska and the western U.S., with below average temperatures in the central U.S. and southwestern Australia
  • Precipitation during June-August was above average across the eastern U.S., western Europe and parts of Scandinavia, with drier than average conditions in India, eastern Australia and parts of Alaska
  • Sea Surface Temperatures (SSTs) continued to increase in the western and central tropical Pacific
 

Contents of this Section:

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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.
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Top of Page Introduction

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 summer 2004, indicating above average temperatures in Alaska, Mongolia, Argentina and Iceland, with cooler than average temperatures over most of the U.S., parts of far eastern Russia and portions of Brazil. During the month of August 2004, above average temperatures occurred in Europe, the pacific northwest of the U.S. and Alaska while cooler than average conditions occurred in the central portion of the U.S., parts of Brazil and western Australia.

The mean position of upper level ridges of high pressure and troughs of low pressure (depicted by positive and negative 500 millibar height anomalies on the June-August 2004 and August 2004 maps) are generally reflected by areas of positive and negative temperature anomalies at the surface, respectively. For other Global products see the Climate Monitoring Global Products page.
Click here for current month's Temperature Dot map
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Click here for current month's Temperature Dot map
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Top of PageTemperature Rankings and Graphics

Current Month / Seasonal / Year-to-date
August Anomaly Rank Warmest Year on Record
Global
Land
Ocean
Land and Ocean
+0.47°C (+0.85°F)
+0.42°C (+0.76°F)
+0.44°C (+0.80°F)
12th warmest
4th warmest
6th warmest
1998 (+0.97°C/1.75°F)
1998 (+0.50°C/0.90°F)
1998 (+0.64°C/1.15°F)
Northern Hemisphere
Land
Ocean
Land and Ocean
+0.62°C (+1.12°F)
+0.58°C (+1.04°F)
+0.59°C (+1.06°F)
8th warmest
3rd warmest
4th warmest
2003 (+1.08°C/1.94°F)
2003 (+0.61°C/1.10°F)
2003 (+0.80°C/1.44°F)
Southern Hemisphere
Land
Ocean
Land and Ocean
+0.05°C (+0.09°F)
+0.31°C (+0.56°F)
+0.26°C (+0.47°F)
49th warmest
7th warmest
12th warmest
1884 (+1.42°C/2.56°F)
1998 (+0.42°C/0.76°F)
1998 (+0.47°C/0.85°F)

Click here for Global Land and Ocean Triad plot
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Click here for Global Hemisphere Triad plot
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June-August Anomaly Rank Warmest Year on Record
Global
Land
Ocean
Land and Ocean
+0.56°C (+1.01°F)
+0.37°C (+0.67°F)
+0.42°C (+0.76°F)
9th warmest
5th warmest
6th warmest
1998 (+0.97°C/1.75°F)
1998 (+0.50°C/1.00°F)
1998 (+0.64°C/1.15°F)
Northern Hemisphere
Land
Ocean
Land and Ocean
+0.60°C (+1.08°F)
+0.50°C (+0.90°F)
+0.54°C (+0.97°F)
10th warmest
2nd warmest
5th warmest
1998 (+1.00°C/1.80°F)
1998 (+0.56°C/1.01°F)
1998 (+0.73°C/1.31°F)
Southern Hemisphere
Land
Ocean
Land and Ocean
+0.34°C (+0.61°F)
+0.28°C (+0.50°F)
+0.29°C (+0.52°F)
16th warmest
10th warmest
11th warmest
1998 (+0.81°C/1.46°F)
1998 (+0.46°C/0.83°F)
1998 (+0.53°C/0.95°F)

Click here for Global Land and Ocean Triad plot
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Click here for Global Hemisphere Triad plot
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January-August Anomaly Rank Warmest Year on Record
Global
Land
Ocean
Land and Ocean
+0.80°C (+1.44°F)
+0.38°C (+0.68°F)
+0.51°C (+0.92°F)
5th warmest
4th warmest
4th warmest
2002 (+1.09°C/1.96°F)
1998 (+0.51°C/0.92°F)
1998 (+0.68°C/1.22°F)
Northern Hemisphere
Land
Ocean
Land and Ocean
+0.89°C (+1.60°F)
+0.46°C (+0.83°F)
+0.63°C (+1.13°F)
5th warmest
2nd warmest
3rd warmest
2002 (+1.21°C/2.18°F)
1998 (+0.53°C/0.95°F)
1998 (+0.77°C/1.39°F)
Southern Hemisphere
Land
Ocean
Land and Ocean
+0.43°C (+0.77°F)
+0.34°C (+0.61°F)
+0.36°C (+0.65°F)
9th warmest
6th warmest
7th warmest
1998 (+0.87°C/1.57°F)
1998 (+0.51°C/0.92°F)
1998 (+0.58°C/1.04°F)

Click here for Global Land and Ocean Triad plot
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Click here for Global Hemisphere Triad plot
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The most current data may be accessed via the Global Surface Temperature Anomalies page.

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Top of Page Precipitation

The maps below represent anomaly values based on the GHCN data set of land surface stations using a base period of 1961-1990. The map to the left is precipitation anomalies measured in millimeters, the map to the right is the percentage of average (1961-1990) precipitation. During June-August 2004, much above average precipitation fell across the eastern half of the U.S., Scandinavia and western Europe. Below average precipitation was observed in Alaska, India and eastern Australia. During the month of August 2004, above average precipitation occurred in the southeastern U.S., Chile and coastal Alaska while drier than average conditions were observed in the southern Brazil, Malaysia and Norway.
Click here for Precipitation Dot map in Millimeters
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Click here for Percent Precipitation Dot map
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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.
Click here for SSM/I Wetness map
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Click here for SSM/I snowcover map
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Top of Page ENSO SST Analysis




Click Here for the last week of the month's ENSO condtions Map
Click here for animated loop





  • Sea Surface Temperatures (SSTs) continued to increase in the western and central tropical Pacific, as an equatorial Kelvin wave moved across the basin during August (as shown in the adjacent animation of weekly sea surface temperature anomalies). A comprehensive summary of August 2004 ENSO conditions can be found on the ENSO monitoring page. For the latest advisory on ENSO conditions go to NOAA's Climate Prediction Center (CPC) and the CPC ENSO Diagnostic Discussion

  • Images of sea surface temperature conditions are available for all months to date during 2004 at the weekly SST page

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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 August 2004, published online September 2004, retrieved on December 21, 2014 from http://www.ncdc.noaa.gov/sotc/global/2004/8.