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Global Climate Trend Since Nov. 16, 1978: +0.14 C Per Decade - July temperatures

July temperatures (preliminary)

Global composite temp.: +0.17 C (about 0.31 degrees Fahrenheit) above 30-year average for July.

Northern Hemisphere: +0.13 C (about 0.23 degrees Fahrenheit) above 30-year average for July.

Southern Hemisphere: +0.22 C (about 0.40 degrees Fahrenheit) above 30-year average for July.

Tropics: +0.08 C (about 0.14 degrees Fahrenheit) above 30-year average for July.

May temperatures (revised):

Global Composite: +0.30 C above 30-year average

Northern Hemisphere: +0.33 C above 30-year average

Southern Hemisphere: +0.26 C above 30-year average

Tropics: +0.22 C above 30-year average

(All temperature anomalies are based on a 30-year average (1981-2010) for the month reported.)

Notes on data released August 5, 2013:

Temperatures in the tropics cooled to near seasonal norms in July, said Dr. John Christy, a professor of atmospheric science and director of the Earth System Science Center (ESSC) at The University of Alabama in Huntsville.

Compared to seasonal norms, during July the coldest area on the globe was off the coast of East Antarctica near the Ross Sea, where the average temperature was as much as 3.89 C (about 6.99 degrees Fahrenheit) cooler than the Antarctic’s winter seasonal norms. Compared to seasonal norms, the “warmest” area on the globe in July was off the coast of Chile in the South Pacific Ocean, where temperatures were as much as 2.31 C (about 4.16 degrees Fahrenheit) warmer than seasonal norms.

Archived color maps of local temperature anomalies are available on-line at:

As part of an ongoing joint project between UAHuntsville, NOAA and NASA, Christy and Dr. Roy Spencer, an ESSC principal scientist, use data gathered by advanced microwave sounding units on NOAA, NASA and EUMETSAT satellites to get accurate temperature readings for almost all regions of the Earth. This includes remote desert, ocean and rain forest areas where reliable climate data are not otherwise available.

The satellite-based instruments measure the temperature of the atmosphere from the surface up to an altitude of about eight kilometers above sea level. Once the monthly temperature data is collected and processed, it is placed in a "public" computer file for immediate access by atmospheric scientists in the U.S. and abroad.

Neither Christy nor Spencer receives any research support or funding from oil, coal or industrial companies or organizations, or from any private or special interest groups. All of their climate research funding comes from federal and state grants or contracts.

Dr. Roy Spencer | Newswise
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