Global Analysis - April 2005


Global Highlights:

  • Based on preliminary data, global averaged combined land and sea surface temperature for April 2005 was 2nd warmest on record.
  • April temperatures were above average over the northern Great Plains of the U.S., Canada, the majority of Australia and eastern Asia. Colder-than-average conditions occurred primarily in far western Alaska, the southern U.S., and India.
  • Precipitation during April was above average over the eastern U.S., the Caribbean and western Europe, with drier than average conditions over much of Asia, the majority of Australia and Alaska.
  • Sea Surface Temperatures (SSTs) were slightly above normal across the central and eastern equatorial Pacific during April

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 April 2005 are shown on the two maps below. 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 weekly product based on data from the Comprehensive Ocean-Atmosphere Data Set (COADS) of SST data. During April, there were above average temperatures over much of Alaska, Canada, Mexico, Algeria, the majority of Europe, the Middle East, eastern China, Australia, as well as from the northern Great Plains to the northeastern U.S. Cooler than average temperatures were observed over the southern U.S., coastal Argentina, far western Alaska, India and parts of western Australia.

Current month's Temperature Dot map
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End of month weekly SST map
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Above average SSTs are also evident in the product above. Slightly warmer than average conditions occurred over large parts of the eastern and central Pacific, reflecting transitioning conditions from an El Niño warm phase to a neutral phase. SSTs were also warmer than average in much of the northern Pacific and northern Atlantic. Cooler than average SSTs were observed over areas northwest of the Hawaiian Islands, off the eastern seaboard of the U.S., and off the east coast of Japan.

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 April 2005 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 months during 2005 at the weekly SST page

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Top of Page Temperature Rankings and Graphics

Current Month / Year-to-date
April Anomaly Rank Warmest Year on Record
Global
Land
Ocean
Land and Ocean
+1.27°C (+2.29°F)
+0.41°C (+0.74°F)
+0.67°C (+1.21°F)
1st warmest
3rd warmest
2nd warmest
2nd - 1998 (+1.23°C/2.21°F)
1998 (+0.51°C/0.92°F)
1998 (+0.72°C/1.30°F)
Northern Hemisphere
Land
Ocean
Land and Ocean
+1.26°C (+2.27°F)
+0.47°C (+0.85°F)
+0.79°C (+1.42°F)
1st warmest
1st warmest
1st warmest
2nd - 1998 (+1.25°C/2.25°F)
2nd - 2004 (+0.46°C/0.83°F)
2nd - 1998 (+0.77°C/1.39°F)
Southern Hemisphere
Land
Ocean
Land and Ocean
+1.06°C (+1.91°F)
+0.38°C (+0.68°F)
+0.51°C (+0.92°F)
2nd warmest
7th warmest
3rd warmest
1998 (+1.07°C/1.93°F)
1998 (+0.56°C/1.01°F)
1998 (+0.66°C/1.19°F)

Global Land and Ocean Triad plot
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Global Hemisphere Triad plot
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January-April Anomaly Rank Warmest Year on Record
Global
Land
Ocean
Land and Ocean
+0.97°C (+1.75°F)
+0.43°C (+0.77°F)
+0.59°C (+1.06°F)
4th warmest
2nd warmest
4th warmest
2002 (+1.37°C/2.47°F)
1998 (+0.51°C/0.92°F)
1998 (+0.72°C/1.30°F)
Northern Hemisphere
Land
Ocean
Land and Ocean
+0.93°C (+1.67°F)
+0.46°C (+0.83°F)
+0.65°C (+1.17°F)
10th warmest
2nd warmest
4th warmest
2002 (+1.60°C/2.90°F)
1998 (+0.51°C/0.92°F)
2002 (+0.86°C/1.55°F)
Southern Hemisphere
Land
Ocean
Land and Ocean
+0.90°C (+1.62°F)
+0.43°C (+0.77°F)
+0.52°C (+0.94°F)
warmest
5th warmest
2nd warmest
2nd - 1998 (+0.87°C/1.57°F)
1998 (+0.54°C/0.97°F)
1998 (+0.60°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 April 2005, above average precipitation fell over the northeastern U.S., the lower Mississippi Valley of the U.S., north-central South America, Puerto Rico, western Europe, southern India and parts of western Australia. Below average precipitation was observed over the southern Great Plains of the U.S., Alaska, the majority of eastern and southeastern Asia, much of Australia, Madagascar and the Iberian Peninsula.

Precipitation Dot map in Millimeters
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Percent Precipitation Dot map
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Top of Page ENSO SST Analysis




Last week of the month's ENSO condtions Map
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  • SSTs decreased in the eastern equatorial Pacific during April, indicating that ENSO is transitioning from a weak warm phase (El Niño) to neutral conditions (shown in the adjacent animation of weekly sea surface temperature anomalies). A comprehensive summary of April 2005 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 during 2005 at the weekly SST page

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Top of 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 April 2005, published online May 2005, retrieved on October 25, 2014 from http://www.ncdc.noaa.gov/sotc/global/2005/4.