Global Analysis - April 2006


Global Highlights:

  • Based on preliminary data, globally averaged combined land and sea surface temperature was 7th warmest on record for April 2006.
  • April 2006 temperatures were above average in Europe, southeastern China and the majority of North America. Colder-than-average conditions occurred in Japan, coastal Alaska, and central Russia.
  • Precipitation during April 2006 was above average in the U.S. northern Rockies, northern Australia and much of the Amazon Basin, with drier-than-average conditions in eastern Australia, the southern U.S. and Malaysia.
  • The transition from La Niña conditions to neutral ENSO conditions continued.

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 PageIntroduction

Temperature anomalies for April 2006 are shown on the two maps below. The dot map on the left provides 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 map on the right is a product of a merged land surface and sea surface temperature anomaly analysis which is based on data from the GHCN of land temperatures and the Comprehensive Ocean-Atmosphere Data Set (COADS) of Sea-Surface Temperature (SST) data. Temperature anomalies with respect to 1961-1990 for land and ocean are analyzed separately and then merged to form the global analysis. Additional information on this product is available.
During April 2006, there were above average temperatures in Algeria, Scandinavia, Iran, eastern Europe, eastern China, and the majority of North America. Cooler than average temperatures were observed in Pakistan, Japan, northeastern China, coastal Alaska and central Russia.

During January-April 2006, there were above average temperatures in the majority of North America, central Africa, much of Asia and Greenland. Cooler than average temperatures were observed in eastern Europe, Alaska and Russia.

In January-April and April 2006, warmer than average SSTs occurred in the South Pacific and the North Atlantic. In January-April 2006, cooler than average conditions were observed in the Niño 3.4 region, and the western coast of Australia. April 2006 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 2006 at the weekly SST page.

This is a break in the document

Top of Page Temperature Rankings and Graphics

Effective with the January 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.
Current Month / Year-to-date
April Anomaly Rank Warmest Year on Record

Global

Land
Ocean
Land and Ocean

+0.56°C (+1.01°F)
+0.41°C (+0.74°F)
+0.45°C (+0.81°F)

13th warmest
6th warmest
8th warmest

2000 (+1.30°C/2.34°F)
1998 (+0.53°C/0.95°F)
1998 (+0.70°C/1.26°F)

Northern Hemisphere

Land
Ocean
Land and Ocean


+0.65°C (+1.17°F)
+0.40°C (+0.72°F)
+0.49°C (+0.88°F)


11th warmest
6th warmest
7th warmest


2000 (+1.66°C/2.99°F)
2004 (+0.53°C/0.95°F)
2005 (+0.83°C/1.49°F)

Southern Hemisphere

Land
Ocean
Land and Ocean


+0.28°C (+0.50°F)
+0.43°C (+0.77°F)
+0.41°C (+0.74°F)


32nd warmest
7th warmest
9th warmest


1992 (+1.41°C/2.54°F)
1998 (+0.59°C/1.06°F)
1998 (+0.63°C/1.13°F)

Global Land and Ocean Triad plot
larger image
Global Hemisphere Triad plot
larger image


January-April Anomaly Rank Warmest Year on Record

Global

Land
Ocean
Land and Ocean

+0.70°C (+1.26°F)
+0.39°C (+0.70°F)
+0.47°C (+0.85°F)

12th warmest
6th warmest
6th warmest

2002 (+1.29°C/2.32°F)
1998 (+0.53°C/0.95°F)
2002 (+0.66°C/1.19°F)

Northern Hemisphere

Land
Ocean
Land and Ocean


+0.76°C (+1.37°F)
+0.34°C (+0.61°F)
+0.50°C (+0.90°F)


12th warmest
6th warmest
9th warmest


2002 (+1.55°C/2.79°F)
2004 (+0.50°C/0.90°F)
2002 (+0.83°C/1.49°F)

Southern Hemisphere

Land
Ocean
Land and Ocean


+0.52°C (+0.94°F)
+0.44°C (+0.79°F)
+0.45°C (+0.81°F)


8th warmest
6th warmest
6th warmest


2005 (+0.89°C/1.60°F)
1998 (+0.56°C/1.01°F)
1998 (+0.61°C/1.10°F)

Global Land and Ocean Triad plot
larger image
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. During April 2006, above average precipitation fell over areas that include Colombia, Chile, South Africa, Burma, Thailand, northeastern Australia, the U.S. northern Rockies and most of northern Brazil. Heavy rain and flooding occurred in parts of Colombia, Yemen, eastern Europe, Agentina, and Indonesia as discussed on the April Hazards page. Below average precipitation was observed in Liberia, Malaysia, the eastern coast of Australia, the southern U.S. and southern Europe. Additional details on drought can also be found on the April Hazards page.


Precipitation Dot map in Millimeters for April
larger image
Percent Precipitation Dot map for April
larger image

This is a break in the document

Top of Page ENSO SST Analysis




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



  • Sea Surface Temperatures were cooler than average across the central tropical Pacific. However, during April La Niña conditions dissipated, indicating a more neutral state of ENSO (shown in the adjacent animation of weekly sea surface temperature anomalies). A comprehensive summary of April 2006 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 during 2006 at the weekly SST page

This is a break in the document

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.

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 April 2006, published online May 2006, retrieved on October 23, 2014 from http://www.ncdc.noaa.gov/sotc/global/2006/4.