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Hottest Year-to-Date on Record

NOAA released its monthly global temperature update for September, showing that 2015 had the hottest September on record. This is the fifth consecutive time in 2015 that a monthly high temperature record has been set.

Through the first nine months of the year, 2015 has been the hottest year on record globally. With the strong El Niño continuing in the Pacific Ocean, it is increasingly likely that 2015 will also finish as the hottest year on record.

Analysis of NOAA’s global temperatures reveals:

  • September 2015 had the highest temperature departure from average for any month in the 136-year period of record.
  • Seven of the nine months so far in 2015, including the last five, have been record warm for their respective months. The other two were in the top 3 (January: 2nd warmest, April: 3rd warmest).
  • The global sea surface temperature was the warmest on record for September registering 1.46°F above the 20th century average. This is nearly half a degree (0.45°F) above the September 1997 temperature, during the last strong El Niño.
  • The year-to-date average temperature across land and ocean surfaces was 1.53°F above the 20th century average, beating the previous record set in 2010 and 2014 by 0.21°F.

The U.S. had its second warmest September on record. Only September 1998 was warmer. Eight individual states had their warmest September on record. Four states (California, Nevada, Oregon, and Washington) are having the hottest year on record through the end of September.