Introduction

The March-May 2003 mean temperature was above the 1988-2002 average across Alaska, western Europe and most of Asia as shown in the adjacent map of blended satellite and in situ data. Cooler than average temperatures occurred over southeastern Brazil and eastern Canada. The mean position of upper level ridges and troughs of low pressure (depicted by positive and negative 500 millibar height anomalies) are generally reflected by areas of positive and negative temperature anomalies at the surface, respectively.

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May temperature anomalies calculated from the Global Historical Climatology Network data set of land surface stations (using a 1961-1990 base period) also show above average temperatures throughout much of Europe, the Middle East, East Asia and Mexico. Monthly temperatures were 2-4°C (3.6-7.2°F) above the mean. Cooler than average temperatures were present throughout the northeastern U.S. into the Great Lakes region and the eastern coast of Australia where monthly temperatures were as much as 1-3°C (1.8-5.4°F) below average.

Temperature

May For May 2003, the global average land and ocean surface temperature was 0.54°C (0.97°F) above the 1880-2002 average, ranking as the second warmest May in the period of record The warmest May occurred in 1998, when the global anomaly was +0.66°C (+1.19°F) Globally averaged land temperatures were warmest on record, 0.96°C (1.73°F) above the long-term mean

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May 2003 temperatures averaged across the Northern Hemisphere were second warmest on record, 0.61°C (1.10°F) above the long term mean Temperatures averaged throughout the Southern Hemisphere were fourth warmest, 0.45°C (0.81°F) above average

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March-May For March-May 2003, the global average land and ocean surface temperature was 0.55°C (0.99°F) above the long term mean, fourth warmest for boreal spring. Ocean surface temperatures were 0.40°C (0.72°F) above the 1880-2001 mean, third warmest for March-May 2003. March-May 2003 temperatures averaged across the Northern Hemisphere were sixth warmest on record, 0.58°C (1.00°F) above the long term mean Temperatures averaged throughout the Southern Hemisphere were third warmest, 0.48°C (0.86°F) above average

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Serial monthly global surface temperature departures with respect to a 1971-2000 mean are shown in the figure to the left Globally averaged surface temperatures (land and ocean) have been warmer than the 1971-2000 average for the last 85 consecutive months

Precipitation

During March-May 2003, much above average precipitation fell across the southeastern U.S., northern Argentina and East Asia Below average precipitation was observed in southern Brazil, most of Canada and the majority of Europe and Australia During the month of May 2003 , unusually wet weather occurred in Scandinavia, western Europe and the East Coast of Australia while areas of Ethiopia, India and the Middle East experienced drier than average conditions. Additional regional analysis can be found on the Global Hazards page

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ENSO SST Analysis

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La Nina conditions continued to develop in May as sea surface temperatures further cooled in the central and equatorial Pacific, as shown in the adjacent animation of weekly sea surface temperature anomalies. This trend as well as others, such as a steady deepening in the central and eastern equatorial Pacific oceanic thermocline are indicators of strengthening La Nina conditions. The most up-to-date information on ENSO (El Nino/Southern Oscillation) conditions can be found at 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 2003 at the weekly sst page

Microwave Sounding Unit Data

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Temperatures in the lowest 8km (5 miles) of the troposphere were 0.14°C (0.25°F) above the 1979-1998 average during March-May 2003 Temperatures in the Northern Hemisphere were 0.24°C (0.43°F) above the mean for March-May 2003 Temperatures in the Southern Hemisphere were 0.04°C (0.07°F) above the mean for March-May 2003 Meanwhile, temperatures for May 2003 in the lower troposphere were 0.18°C (0.32°F) above average

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March-May 2003 temperatures were below the 1984-1990 average in the lower stratosphere, -0.27°C (-0.49°F) cooler than the mean Stratospheric temperatures in May 2003 were also below average globally, with a departure of -0.31°C (-0.59°F)

  For additional details on precipitation and temperatures in May, see the Global Hazards 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.

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For questions about this report, please contact:

David Easterling
NOAA/National Climatic Data Center
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fax: 828-271-4328
email: David.Easterling@noaa.gov

-or-

Jay Lawrimore
NOAA/National Climatic Data Center
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Asheville, NC 28801-5001
fax: 828-271-4328
email: Jay.Lawrimore@noaa.gov

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