July global temps fourth highest on record

August 15th, 2012 at 12:15 pm by under Weather

From the NOAA NCDC:

July 2012 Selected Climate Anomalies and Events Map

Global Highlights

  • The average combined global land and ocean surface temperature for July 2012 was 0.62°C (1.12°F) above the 20th century average of 15.8°C (60.4°F). This is the fourth warmest July since records began in 1880.
  • The globally-averaged land surface temperature for July 2012 was the third warmest July on record, at 0.92°C (1.66°F) above average.
  • The Northern Hemisphere land surface temperature for July 2012 was the all-time warmest July on record, at 1.19°C (2.14°F) above average.
  • ENSO-neutral conditions continued in the eastern equatorial Pacific Ocean during July 2012 as sea surface temperature anomalies in that region continued to rise. The average July worldwide ocean surface temperature ranked as the seventh warmest July on record.
  • The combined global land and ocean average surface temperature for January–July 2012 was the 10th warmest such period on record, at 0.53°C (0.95°F) above the 20th century average.


Please Note: The data presented in this report are preliminary. Ranks and anomalies may change as more complete data are received and processed. Effective with the July 2010 State of the Climate Report, NCDC transitioned to the new version (version 3b) of the extended reconstructed sea surface temperature (ERSST) dataset. ERSST.v3b is an improved extended SST reconstruction over version 2. For more information about the differences between ERSST.v3b and ERSST.v2 and to access the most current data, please visit NCDC’s Global Surface Temperature Anomalies page.

Introduction

Temperature anomalies for July 2012 are shown on the dot maps below. The dot maps on the left provide 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 maps on the right are a product of a merged land surface and sea surface temperature (SST) anomaly analysis developed by Smith et al. (2008). For the merged land surface and SST analysis, temperature anomalies with respect to the 1971–2000 average for land and ocean are analyzed separately and then merged to form the global analysis. For more information, please visit NCDC’s Global Surface Temperature Anomalies page.

 


Temperatures

In the atmosphere, 500-millibar height pressure anomalies correlate well with temperatures at the Earth’s surface. 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 July 2012 map—is generally reflected by areas of positive and negative temperature anomalies at the surface, respectively.

July

July 2012 Land Surface Temperature Anomalies in degrees Celsius (Courtesy: NCDC)

July 2012 Blended Land and Sea Surface Temperature Anomalies in degrees Celsius (Courtesy: NCDC)

The average global temperature across land and oceans during July 2012 was 0.62°C (1.12°F) above the 20th century average of 15.8°C (60.4°F) and ranked as the fourth warmest July since records began in 1880. The previous three months—April, May, and June—also ranked among the top five warmest for their respective months. July 2012 marks the 36th consecutive July and 329th consecutive month with a global temperature above the 20th century average. The last below-average July temperature was July 1976 and the last below-average temperature for any month was February 1985. It was the second warmest July in the Northern Hemisphere, behind only the record warmth of 2010. The Southern Hemisphere had its 13th warmest July on record.

The globally averaged temperature over land areas was the third highest for July on record. Notably, it was the warmest July on record for the Northern Hemisphere, where the majority of Earth’s land mass is located. This is the fourth month in a row that the Northern Hemisphere has set a new monthly land temperature record. The Southern Hemisphere land temperature was also above average for July, but not as extreme, ranking 33rd in the 133-year period of record.

  • The average temperature for the contiguous United States during July was 1.8°C (3.3°F) above the 20th century average, marking the warmest July and all-time warmest month since national records began in 1895, surpassing the previous record warmth of July 1936.
  • Some of the greatest anomalous warmth in Canada was observed in the country’s southern province of Ontario, particularly in northwestern Ontario and the Far North where record-breaking monthly temperatures occurred, according to Environment Canada. Throughout the province, the average July temperature was as much as 3.5°C (6.3°F) above average.
  • Norway as a whole was 0.3°C (0.5°F) cooler than average for the month of July. This marks the country’s 30th coolest July since national records began in 1900. The coolest anomalies of -1.0 to -1.5°C (-1.8 to -2.7°F) were observed in the northern regions.
  • It was also cooler than average in the United Kingdom, where the July 2012 temperature anomaly was 1.0°C (1.8°F) below the long-term average. This was the coolest July since 2000.
  • While the area-averaged monthly maximum temperature for Australia was close to normal, the monthly average minimum temperature was the coolest July in the past 30 years and the eighth coolest July in the country’s 63-year period of record, at 0.96°C (1.73°F) below average. The state of Western Australia reported its lowest average July minimum temperature on record—1.71°C (3.08°F) below average.

Read more about the oceans’ temperatures and global precipitation here.

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