Global Analysis - May 2007


Global Highlights:

  • Based on preliminary data, globally averaged combined land and sea surface temperature was the third warmest on record for boreal spring (March - May 2007) and the fourth warmest for May.
  • March - May 2007 temperatures were above average in Europe, Asia, western Africa, eastern Brazil, and most of the contiguous U.S. Cooler-than-average conditions occurred in southern Alaska and parts of Argentina and Chile.
  • Precipitation during March - May 2007 was above average in Uruguay, the central and northeastern region of the contiguous U.S., northwestern Australia, southern Brazil, and most of Europe. Drier than average conditions were observed in the southeastern and western U.S., the eastern coast of Australia, and parts of Asia.
  • ENSO conditions remained in a neutral phase during May.

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 PageIntroduction

Temperature anomalies for March - May 2007 and May 2007 are shown on the dot maps below. The dot maps, below left, provide a spatial representation of anomalies calculated from the Global Historical Climatology Network (GHCN) data set of land surface stations using a 1961-1990 base period. The dot maps, below right, are a product of a merged land surface and sea surface temperature anomaly analysis developed by Smith and Reynolds (2005). Temperature anomalies with respect to the 1961-1990 mean for land and ocean are analyzed separately and then merged to form the global analysis. Additional information on this product is available.

Anomalously warm temperatures covered much of the globe throughout the first few months of the year. The January-May 2007 year-to-date map of temperature anomalies shows the presence of warmer than average temperatures across all land areas with the exception of cooler than average temperatures in Alaska and Argentina. Warmer than average Sea Surface Temperatures (SSTs) occured in the northwestern Pacific, North Atlantic and the North Indian Ocean. Cooler than average conditions were observed in the northeastern Pacific and some areas in the South Atlantic, South Indian, and South Pacific oceans.

During boreal spring, temperatures were above average in Europe, Asia, western Africa, eastern Brazil, and most of the contiguous U.S. Cooler than average conditions occurred in southern Alaska and parts of Argentina and Chile. Warmer than average SSTs were observed across the North Atlantic, North Indian, and northwestern Pacific oceans. Cooler than average SSTs were observed in areas of the eastern equatorial and northeastern Pacific Ocean and parts of the South Pacific and South Indian oceans.
Current season's Land Surface Temperature Dot map
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Current season's blended Land and sea surface Temperature Dot map
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During May, there were above average temperatures across the contiguous U.S., Europe, Asia, and western Africa. Cooler than average temperatures were observed in Finland and southern areas of South America. Warmer than average SSTs occurred in the North Atlantic, North Indian, and northwestern Pacific oceans. In the Niño regions, SST anomalies were near or slightly below average, indicative of a neutral ENSO phase. Please see the latest ENSO discussion for additional information.

Current month's Land SurfaceTemperature Dot map
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Current month's blended Land and sea surface Temperature Dot map
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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 March - May 2007 and the May 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.

Images of sea surface temperature conditions are available for all weeks during 2007 at the weekly SST page.

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Top of Page Temperature Rankings and Graphics

Effective with the February 2006 report, NCDC transitioned from the use of the Operational Global Surface Temperature Index (Quayle et al. 1999) to the blended land and ocean dataset developed by Smith and Reynolds (2005). The differences between the two methods are discussed in Smith et al. (2005).

The combined global land and ocean surface temperature for May was the fourth warmest on record. The global surface temperature for the combined January-May period tied with 1998 as the warmest January-May on record. Separately, the global land-surface temperature was the warmest on record for boreal spring (March-May), as well as for the year-to-date period and second warmest for May. The May ocean-surface temperature was the 9th warmest in the 128-year period of record as near average to cooler than average conditions were present across the equatorial Pacific.

Current Month / Seasonal / Year-to-date
May Anomaly Rank Ties Warmest (or Next
Warmest)Year on Record

Global

Land
Ocean
Land and Ocean

+0.93°C (+1.67°F)
+0.37°C (+0.67°F)
+0.52°C (+0.94°F)

2nd warmest
9th warmest
4th warmest

2001

2003

2005 (+0.94°C/1.69°F)
1998 (+0.54°C/0.97°F)
1998 (+0.62°C/1.12°F)

Northern Hemisphere

Land
Ocean
Land and Ocean


+1.15°C (+2.07°F)
+0.38°C (+0.68°F)
+0.67°C (+1.21°F)


2nd warmest
8th warmest
2nd warmest





2001 (+1.17°C/2.11°F)
2005 (+0.60°C/1.08°F)
2005 (+0.73°C/1.31°F)

Southern Hemisphere

Land
Ocean
Land and Ocean


+0.30°C (+0.54°F)
+0.36°C (+0.65°F)
+0.36°C (+0.65°F)


25th warmest
10th warmest
11th warmest


1990,1991


1981 (+1.11°C/2.00°F)
1998 (+0.58°C/1.04°F)
1998 (+0.61°C/1.10°F)

Global Land and Ocean Triad plot
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Global Hemisphere Triad plot
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March-May Anomaly Rank Ties Warmest (or Next
Warmest) Year on Record

Global

Land
Ocean
Land and Ocean

+1.15°C (+2.07°F)
+0.40°C (+0.72°F)
+0.60°C (+1.08°F)

warmest
8th warmest
3rd warmest



2005 (+1.13°C/2.03°F)
1998 (+0.53°C/0.95°F)
2005 (+0.65°C/1.17°F)

Northern Hemisphere

Land
Ocean
Land and Ocean

+1.33°C (+2.39°F)
+0.42°C (+0.76°F)
+0.76°C (+1.37°F)

2nd warmest
5th warmest
2nd warmest


2003

2000 (+1.35°C/2.43°F)
2005 (+0.52°C/0.94°F)
2005 (+0.77°C/1.39°F)

Southern Hemisphere

Land
Ocean
Land and Ocean

+0.61°C (+1.10°F)
+0.38°C (+0.68°F)
+0.42°C (+0.76°F)

8th warmest
9th warmest
8th warmest



2005 (+0.95°C/1.71°F)
1998 (+0.57°C/1.03°F)
1998 (+0.62°C/1.12°F)

Global Land and Ocean Triad plot
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Global Hemisphere Triad plot
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January-May Anomaly Rank Ties Warmest (or Next
Warmest) Year on Record

Global

Land
Ocean
Land and Ocean

+1.26°C (+2.27°F)
+0.43°C (+0.77°F)
+0.65°C (+1.17°F)

warmest
6th warmest
warmest



1998

2002 (+1.15°C/2.07°F)
1998 (+0.53°C/0.95°F)
2002 (+0.64°C/1.15°F)

Northern Hemisphere

Land
Ocean
Land and Ocean


+1.47°C (+2.65°F)
+0.44°C (+0.79°F)
+0.83°C (+1.49°F)


warmest
4th warmest
warmest




2002 (+1.34°C/2.41°F)
1998 (+0.50°C/0.90°F)
2002 (+0.76°C/1.37°F)

Southern Hemisphere

Land
Ocean
Land and Ocean


+0.63°C (+1.13°F)
+0.42°C (+0.76°F)
+0.45°C (+0.81°F)


4th warmest
8th warmest
6th warmest




2005 (+0.88°C/1.58°F)
1998 (+0.57°C/1.03°F)
1998 (+0.61°C/1.10°F)

Global Land and Ocean Triad plot
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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. During boreal spring, above average precipitation fell over areas that include Uruguay, the central and the northeastern region of the contiguous U.S., northwestern Australia, southern Brazil, and most of Europe. Drier than average conditions were observed in the southeastern and western U.S., the eastern coast of Australia, and parts of Asia.


During May 2007, above average precipitation fell over areas that include the central U.S. and most of Europe and Asia. Below average precipitation was observed in the Middle East, the eastern U.S., and parts of South America and Australia. Additional details on flooding and drought can also be found on the May Global Hazards page.

Precipitation Dot map in Millimeters for March-May
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Precipitation Dot map in Millimeters for May
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Top of Page ENSO SST Analysis




Last week of the month's ENSO condtions Map
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  • Sea Surface Temperature anomalies were near average or slightly cooler than average across the equatorial Pacific, indicative of a neutral ENSO phase (shown in the adjacent animation of weekly sea surface temperature anomalies). A comprehensive summary of May 2007 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 weeks since 2003 at the weekly SST page.

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Peterson, T.C. and R.S. Vose, 1997: An Overview of the Global Historical Climatology Network Database. Bull. Amer. Meteorol. Soc., 78, 2837-2849.

Quayle, R. G., T. C. Peterson, A. N. Basist, and C. S. Godfrey, 1999: An operational near-real-time global temperature index. Geophys. Res. Lett., 26, 333-335.

Smith, T. M., and R. W. Reynolds (2005), A global merged land air and sea surface temperature reconstruction based on historical observations (1880-1997), J. Clim., 18, 2021-2036.

Citing This Report

NOAA National Climatic Data Center, State of the Climate: Global Analysis for May 2007, published online June 2007, retrieved on November 26, 2014 from http://www.ncdc.noaa.gov/sotc/global/2007/5.