Global Temperature Report: August 2018
Global climate trend since Dec. 1 1978: +0.13 C per decade
August Temperatures (preliminary)
Global composite temp.: +0.19 C (+0.34 °F) above seasonal average
Northern Hemisphere.: +0.21 C (+0.38°F) above seasonal average
Southern Hemisphere.: +0.16 C (+0.29 °F) above seasonal average
Tropics.: +0.12 C (+0.22 °F) above seasonal average
July Temperatures (final)
Global composite temp.: +0.32 C (+0.58 °F) above seasonal average
Northern Hemisphere.: +0.42 C (+0.76°F) above seasonal average
Southern Hemisphere.: +0.21 C (+0.38 °F) above seasonal average
Tropics.: +0.29 C (+0.52 °F) above seasonal average
Notes on data released September 6, 2018
The seasonally-adjusted global average temperature fell slightly to +0.19 °C (+0.34 °F) as nearly all regions of the globe cooled relative to their July readings. For the first 8 months of the 2018 calendar year, the atmosphere is averaging a departure from average of +0.23 °C (+0.41 °F) which is cooler than observed since 2014 when the annual average was +0.18 °C (+0.32 °F).
The coolest seasonally adjusted temperature was found in the far southeastern Pacific Ocean at -3.42 °C (-6.16 °F) below average. The warmest spot was near Dome Fuji in East Antarctica at +3.91 °C (+7.04 °F). The tropics as a whole show virtually no noticeable departures from average. Especially warm areas occurred in the Gulf of Alaska, Canadian
Maritime Provinces, Eastern Europe, northern China, far South Atlantic and East Antarctica. Cooler than average regions covered Arctic Canada, Iceland, Sea of Okhotsk and parts of the far southern oceans.
While the outlook for a developing warm El Niño is still “favorable” according to NOAA (3 Sep 2018), the Pacific sea surface temperatures are giving mixed signals, being very warm north of the equator, but cooler than average south of the equator. The deeper ocean heat content down to 300 m is above average in the Pacific so provides evidence still
pointing toward warmer (El Niño) conditions in the coming months. If this occurred it would be followed by warmer atmospheric temperatures a few months later. We will monitor developments of this unusual situation.
As part of an ongoing joint project between UAH, NOAA and NASA, Christy and Dr. Roy Spencer, an ESSC principal scientist, use data gathered by advanced microwave sounding units on NOAA and NASA 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. They are assisted by Dr. W. Daniel Braswell and Robert Junod in the generation of these products.
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 are collected and processed, they are placed in a “public” computer file for immediate access by atmospheric scientists in the U.S. and abroad.
The complete version 6 lower troposphere dataset is available here:
Archived color maps of local temperature anomalies are available on-line at:
Neither Christy nor Spencer receives any research support or funding from oil, coal or industrial companies orrganizations, or from any private or special interest groups. All of their climate research funding comes from federal and state grants or contracts.
— 30 —
NOTE: about an hour after publication here, Dr. John Christy wrote in with some corrections to the data from their press release. The data for July temperatures has been changed to reflect this correction as well as the number in the headline, from .31 to .32 and the Northern and Southern hemispheric temps have been corrected also. – Anthony