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NASA & NOAA: July 2012 Was 12th, 4th Warmest on Record

According to data released by NASA and NOAA this week, July 2012 was the 12th and 4th warmest July (respectively) globally on record. NASA’s analysis produced the 12th warmest July in its dataset; NOAA recorded the 4th warmest July in its dataset. The two agencies have slightly different analysis techniques, which in this case resulted in not only different temperature anomaly values but rather different rankings as well.

The details:

July’s global average temperatures were 0.47°C (0.85°F) above normal (1951-1980), according to NASA, as the following graphic shows. The warmest regions on Earth coincide with the locations where climate models have been projecting the most warmth to occur for years: high latitudes (especially within the Arctic Circle in July 2012). The past three months have a +0.56°C temperature anomaly. And the latest 12-month period (Aug 2011 – Jul 2012) had a +0.50°C temperature anomaly. The time series graph in the lower-right quadrant shows NASA’s 12-month running mean temperature index. The recent downturn (post-2010) is largely due to the latest La Niña event (see below for more) that recently ended. As ENSO conditions return to neutral or even El Niño-like, the temperature trace should track upward again.

Photobucket

Figure 1. Global mean surface temperature anomaly maps and 12-month running mean time series through July 2012 from NASA.

According to NOAA, July’s global average temperatures were 0.63°C (1.13°F) above the 20th century mean of 15.2°C (1.12°F). NOAA’s global temperature anomaly map for July (duplicated below) reinforces the message: high latitudes continue to warm at a faster rate than the mid- or low-latitudes. Unfortunately in July 2012, almost the entire Northern Hemisphere was warmer than normal. [cont’d.]

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NASA & NOAA: July 2012 Was 12th, 4th Warmest On Record

According to data released by NASA and NOAA this week, July 2012 was the 12th and 4th warmest July (respectively) globally on record.  NASA’s analysis produced the 12th warmest July in its dataset; NOAA recorded the 4th warmest July in its dataset.  The two agencies have slightly different analysis techniques, which in this case resulted in not only different temperature anomaly values but rather different rankings as well.

The details:

July’s global average temperatures were 0.47°C (0.85°F) above normal (1951-1980), according to NASA, as the following graphic shows.  The warmest regions on Earth coincide with the locations where climate models have been projecting the most warmth to occur for years: high latitudes (especially within the Arctic Circle in July 2012).  The past three months have a +0.56°C temperature anomaly.  And the latest 12-month period (Aug 2011 – Jul 2012) had a +0.50°C temperature anomaly.  The time series graph in the lower-right quadrant shows NASA’s 12-month running mean temperature index.  The recent downturn (post-2010) is largely due to the latest La Niña event (see below for more) that recently ended.  As ENSO conditions return to neutral or even El Niño-like, the temperature trace should track upward again.

Photobucket

Figure 1. Global mean surface temperature anomaly maps and 12-month running mean time series through July 2012 from NASA.

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