Climate of 2009
June in Historical Perspective
National Climatic Data Center
16 July 2009
Use these links to access detailed analyses of Global and U.S. data.
Global Highlights:
- Based on preliminary data, the globally averaged combined land and sea surface temperature was the second warmest on record for June and the January-June year-to-date tied with 2004 as the fifth warmest on record.
- Large portions of each inhabited continent were substantially warmer than average during June 2009. The warmest anomalies were most notable in parts of Africa and most of Eurasia. The most notable cooler-than-average temperatures were present from the southwestern U.S. to the Northern Plains, the Canadian Prairie Provinces, central Asia, and across the boundary of northeastern China and southeastern Russia.
- The most notable above-average precipitation during June 2009 was present across parts of central and northeastern Europe, eastern Asia, northern Brazil, and most of the northern half of the contiguous United States. The driest anomalies occurred across India, southeastern Asia, northern South America, southeastern and south central contiguous U.S., and parts of the western Pacific Islands.
- El Niño–Southern Oscillation (ENSO) transitioned from ENSO-neutral to El Niño conditions across the equatorial Pacific Ocean during June 2009. If El Niño conditions continue to mature as projected by NOAA, global temperatures are likely to continue to threaten previous record highs.
Introduction
Please Note: Beginning with the July 2009 State of the Climate Report, NCDC will switch to a new version (version 3b) of the extended reconstructed sea surface temperature (ERSST) dataset. ERSST.v3b is an improved extended SST reconstruction over version 2. Most of the improvements are justified by testing with simulated data. The primary difference in version 3b, compared to version 2, is improved low-frequency tuning that increases the sensitivity to data prior to 1930. In ERSST v3b, satellite data was removed from the ERSST product. The addition of satellite data from 1985 to present caused problems for many users. Although the satellite data were corrected with respect to the in situ data, a small residual cold bias remained at high southern latitudes where in situ data were sparse. For more information about the differences between ERSST.v3b and ERSST.v2 please read Summary of Recent Changes in the Land-Ocean Temperature Analyses and Improvements to NOAA's Historical Merged Land-Ocean Surface Temperature Analysis (1880-2006) paper.
Temperature anomalies for June 2009 are shown on the dot maps below. The dot map on the left provides a spatial representation of anomalies calculated from the Global Historical Climatology Network (GHCN) dataset of land surface stations using a 1961-1990 base period. The dot map on the right is a product of a merged land surface and sea surface temperature (SST) anomaly analysis developed by Smith and Reynolds (2005). Temperature anomalies with respect to the 1961-1990 average for land and ocean are analyzed separately and then merged to form the global analysis. Additional information on this product is available.
Large portions of each inhabited continent were substantially warmer than average during June 2009. Above-average temperatures were observed across Africa, Australia, eastern Brazil, south central and southeastern contiguous U.S., Alaska's panhandle, western Alaska, western Canada, and most of Europe and Asia. The most notable warmer-than-average temperatures were recorded across parts of Africa and most of Eurasia, where temperatures were 3°C (5°F) or more above average. Cooler-than-average conditions were present across Scandinavia, parts of the southwestern U.S. to the Northern Plains, the northeastern U.S., the Canadian Prairie Provinces, southern South America, central Asia, and across the boundary of northeastern China and southeastern Russia.
Sea surface temperatures during June 2009 were warmer than average across much of the world's oceans, with the exception of cooler-than-average conditions across the southern oceans. The global ocean SST for June 2009 was the warmest on record, 0.59°C (1.06°F) above the 20th century average of 16.4°C (61.5°F). This broke the previous June record set in 2005. Sea surface temperature anomalies in all Niño regions continued to warm during June 2009, where the monthly temperatures were more than 0.5°C (0.9°F) above average. If El Niño conditions continue to mature as projected by NOAA, global temperatures are likely to continue to threaten previous record highs. Please see the June 2009 ENSO discussion for additional information.
The January-June 2009 map of temperature anomalies shows the presence of warmer-than-average conditions across much of the world's land areas, with the exception of cooler-than-average temperatures across Canada. Sea surface temperatures were warmer than average across the North Indian and western Pacific oceans, and most of the Atlantic Ocean. Cooler-than-average SSTs were present across the central equatorial Pacific Ocean, along the western coasts of North America and northwestern Africa, and across most of the southern oceans.
The average position of the upper-level ridges of high pressure and troughs of low pressure (depicted by positive and negative 500-millibar height anomalies on the June 2009 map, respectively) are generally reflected by areas of positive and negative temperature anomalies at the surface, respectively. For other Global products, please see the Climate Monitoring Global Products page.
Images of sea surface temperature conditions are available for all weeks during 2009 from the weekly SST page.
Temperature Rankings and Graphics
The combined global land and ocean surface temperature was the second warmest on record in June, behind 2005, and tied with 2004 as the fifth warmest on record for the year-to-date (January-June) period. The global ocean had the warmest June on record. The ranks found in the tables below are based on records that began in 1880.
Readers, go to the link to see all the tables -- much, much more info at the NCDC page:http://www.ncdc.noaa.gov/oa/climate/research/2009/jun/global.html
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