Global Analysis - July 2004


Global Highlights:

  • Based on preliminary data for July 2004, global average combined land and sea surface temperature was sixth warmest on record
  • July temperatures were above average throughout Alaska, the western half of North America and Scandinavia, with below average temperatures in the Great Plains of the U.S. and adjoining parts of Canada as well as the United Kingdom
  • Precipitation during July was above average across the Great Plains of the U.S., the majority of Europe and much of South America, with drier than average conditions in Alaska, India and Japan
  • Near-neutral SSTs across the central equatorial Pacific basin prompted forecasts of a developing El Niño.
 

Contents of this Section:

This is a break in the document
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.
This is a break in the document

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 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.

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 July 2004 map) 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
larger image
Click here for current month's Blended Temperature map
larger image

This is a break in the document

Top of PageTemperature Rankings and Graphics

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)

Click here for Global Land and Ocean Triad plot
larger image
Click here for Global Hemisphere Triad plot
larger image
January-July Anomaly Rank Warmest Year on Record
Global
Land
Ocean
Land and Ocean
+0.85°C (+1.53°F)
+0.38°C (+0.68°F)
+0.52°C (+0.94°F)
3rd warmest
4th warmest
4th warmest
2002 (+1.15°C/2.07°F)
1998 (+0.51°C/0.92°F)
1998 (+0.70°C/1.26°F)
Northern Hemisphere
Land
Ocean
Land and Ocean
+0.93°C (+1.67°F)
+0.44°C (+0.80°F)
+0.64°C (+1.15°F)
4th warmest
2nd warmest
3rd warmest
2002 (+1.29°C/2.32°F)
1998 (+0.52°C/0.94°F)
1998 (+0.77°C/1.39°F)
Southern Hemisphere
Land
Ocean
Land and Ocean
+0.49°C (+0.88°F)
+0.35°C (+0.63°F)
+0.38°C (+0.68°F)
8th warmest
7th warmest
6th warmest
1998 (+0.89°C/1.60°F)
1998 (+0.52°C/0.94°F)
1998 (+0.59°C/1.06°F)

Click here for Global Land and Ocean Triad plot
larger image
Click here for Global Hemisphere Triad plot
larger image



The most current data may be accessed via the Global Surface Temperature Anomalies page.

This is a break in the document

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 July 2004, much above average precipitation fell across the northeastern U.S., southeastern Asia, eastern Europe and Argentina. Below average precipitation was observed in the eastern half of Australia, India, Norway and Mongolia.
Click here for Precipitation Dot map in Millimeters
larger image
Click here for Percent Precipitation Dot map
larger image

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
larger image
Click here for SSM/I snowcover map
larger image

This is a break in the document

Top of Page ENSO SST Analysis




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





  • Warming in the central equatorial Pacific prompted forecasts of a developing El Niño (as shown in the adjacent animation of weekly sea surface temperature anomalies). A consensus of indices suggests near-neutral ENSO conditions. A comprehensive summary of July 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 This is a break in the document

    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 August 27, 2014 from http://www.ncdc.noaa.gov/sotc/global/2004/7.