July Warmest Month Ever Recorded Globally

2015 the hottest year on record (so far)

Global: The combined average temperature over land and ocean surfaces for July 2015 was the highest since record-keeping began 136 years ago. At 0.81°C (1.46°F) above the 20th century average of 15.8°C (60.4°F), it surpassed the previous record set in July 1998 by 0.08°C (0.14°F), said NOAA.

As July is climatologically the warmest month of the year globally, this monthly global temperature of 16.61°C (61.86°F) was also the highest among all 1627 months in the record that began in January 1880. The July temperature is currently increasing at an average rate of 0.65°C (1.17°F) per century.

• July average temperature across global land surfaces was 0.96°C (1.73°F) above the 20^th century average, making it the sixth warmest July on record.

• Global sea surface temperature in July was 0.75°C (1.35°F) above the 20^th century average of 16.4°C (61.5°F), the highest departure not only for July, but for any month on record. The 10 highest monthly departures from average for the oceans have all occurred in the past 16 months (since April 2014).

The first seven months of 2015 were the warmest such period on record for global land and ocean surfaces, at 0.85°C (1.53°F) above the 20^th century average, surpassing the previous record set in 2010 by 0.09°C (0.16°F).

• Five months this year, including the past three, have been record warm for their respective months. January was the second warmest January on record and April third warmest.

• The average global sea surface temperature of +0.67°C (+1.21°F) for the year-to-date was the highest for January–July in the 136-year period of record, surpassing the previous record of 2010 by 0.06°C (0.11°F). The average land surface temperature of +1.34°C (+2.41°F) was also the highest on record, surpassing the previous record of 2007 by 0.15°C (0.27°F).

Nine of the 10 warmest months since records began in 1880 (1,627 months ago) have occurred since 2005, reported NOAA.

Selected National Temperature Highlights

The UK experienced its warmest July day ever on July 1, 2015 when temperatures climbed to 36.7°C near London, UK Met Office reported.

Austria recorded its hottest July since national records began in 1767. The average temperature was 3.0°C (5.0°F) higher than the 1981–2010 average, beating the previous record of +2.7°C (+4.9°F) set in 2006.

• Temperature reached a high of 38.2°C (100.8°F) in Innsbruck, highest in recorded history, on July 7^th.

France had its third warmest July in its 116-year period of record, with the overall temperature climbing 2.1°C (3.8°F) above the 1981–2010 average. Localized departures of more than 4°C (7°F) were recorded in the Massif Central to the North East and the Alps, said MeteoFrance.

Middle East experienced one of the most extreme heat indices ever recorded anywhere on July 31^st, due to a high pressure dome that resided over the region.  The city of Bandar Mahshahr, Iran, recorded the air temperature of 46°C (115°F) together with a dew point of 32°C (90°F) resulting in a heat index of 74°C (165°F). The highest recorded heat index of 81°C (178°F) was in Dhahran, Saudi Arabia on July 8^th, 2003.

NOAA National Centers for Environmental Information, State of the Climate: Global Analysis for July 2015, published online August 2015, retrieved on August 20, 2015 from http://www.ncdc.noaa.gov/sotc/global/201507.

 

2014 Hottest Year on Record: NOAA

UPDATED January 17, 2014

2014 Hottest year on record at 0.69°C (1.24°F) above the 20th century average

The December 2014 average combined global land and ocean surface temperature was the highest on record since record-keeping began 135 years ago, at 0.77°C (1.39°F) above the 20th century average of 12.2°C (54.0°F), making 2014 the warmest year on record, according to the latest State of the Climate report released by NCDC/NOAA.

January–December 2014 Blended Land and Sea Surface Temperature Anomalies in degrees Celsius

 

Selected Highlights

• The December 2014 globally-averaged temperature for land and ocean surfaces combined was 0.77°C (1.39°F) above the 20^th century average of 12.2°C (54.0°F), the highest on record for December since records began in 1880.
• The January–December temperatures were warmer than average across the vast majority of the globe during 2014, resulting in  record warmth for 2014, at 0.69°C (1.24°F) above the 20^th century average.
• The 2014 average global ocean surface temperature was also the highest on record, at 0.55°C (0.99°F) above average.
• The highest temperature anomalies (more than 5°C / 9°F above the 1981–2010 average) were observed in parts of Alaska and Siberia.

December 2014 Selected Climate Anomalies and Events Map

Source: NOAA National Climatic Data Center, State of the Climate: Global Analysis for December 2014, published online January 2015, retrieved on January 16, 2015 from http://www.ncdc.noaa.gov/sotc/global/2014/12.

The latest data show that 14 of the 15 warmest years on record have occurred this century.

2001-2010 was the warmest decade on record.

The Atmospheric Temperatures

Two different analyses examined NOAA satellite-based data records for the lower and middle troposphere and the lower stratosphere.

• The 2014 temperature for the lower troposphere (roughly the lowest five miles of the atmosphere) was third highest in the 1979-2014 record, at 0.50°F (0.28°C) above the 1981–2010 average, as analyzed by the University of Alabama Huntsville (UAH), and sixth highest on record, at 0.29°F (0.16°C) above the 1981–2010 average, as analyzed by Remote Sensing Systems (RSS).
• The 2014 temperature for the mid-troposphere (roughly two miles to six miles above the surface) was third highest in the 1979–2014 record, at 0.32°F (0.18°C) above the 1981–2010 average, as analyzed by UAH, and sixth highest on record, at 0.25°F (0.14°C) above the 1981–2010 average, as analyzed by RSS.
• The temperature for the lower stratosphere (roughly 10 miles to 13 miles above the surface) was 13^th lowest in the 1979–2014 record, at 0.56°F (0.31°C) below the 1981–2010 average, as analyzed by UAH, and also 13^th lowest on record, at 0.41°F (0.23°C) below the 1981–2010 average, as analyzed by RSS. The stratospheric temperature is decreasing on average while the lower and middle troposphere temperatures are increasing on average, consistent with expectations in a greenhouse-warmed world. [NOAH]
  

Related Links

• 2014 U.S. Temperature Tops 20th-Century Average (Again) January 10, 2015
• Year-to-Date Global Temperature Highest on Record December 16, 2014