NOAA’s National Climatic Data Center (NCDC) have announced that the Earth has just experienced its warmest June on record, 0.68°C warmer than the 20th-century June average of 15.5°C. Most of the globe was warmer than usual, with the highest temperature anomalies seen in eastern and western Asia, eastern North America, western South America, and most of the Atlantic Ocean. The only surface temperatures much cooler than average were in the eastern Pacific and Southern Oceans. The warmest June is particularly notable in that it follows the warmest March, April, and May.
(Global temperatures are usually given as anomalies relative to a 20th century average because they are easier and more useful to compare than absolute temperatures. The last month with a temperature below average was February 1985.)
Let’s quickly recap the year so far. It began with an unusually cold winter in northern land areas, related to the Arctic Oscillation (AO), which in February 2010 was at its most negative value on record, moving heat to Arctic regions. Despite the unfortunate and disproportionate impact this had on public opinion, January was a relatively warm month globally, and the Southern Hemisphere had its warmest February on record. Read the rest of this entry ?