National Oceanic and Atmospheric Administration State of the Climate

  • September 2017 National Climate Report
    The September contiguous U.S. average temperature was 66.3 degrees F, 1.4 degrees F above the 20th century average.The precipitation total was 2.22 inches, 0.27 inches below average.... Read more »
  • September 2017 Global Climate Report
    The combined average temperature over global land and ocean surfaces for September was equal to the 20th century average of 15.5 degrees C (59.9 degrees F).... Read more »
  • September 2017 Regional Analysis
    September temperature anomalies relative to their 1910-2000 mean: North America, +1.28 deg C; South America, +1.30 deg C; Europe, +0.89 deg C; Africa, +1.37 deg C; Asia, +0.94 deg C; Oceania, +1.17 deg C.... Read more »
  • September 2017 Drought
    As of September 26th, 11.65% of the Contiguous U.S. was experiencing drought conditions, 4.19% was in severe drought, 1.97% extreme, and 0.72% exceptional.... Read more »
  • September 2017 Synoptic Discussion
    The Earth's ocean-atmosphere system was technically in an ENSO-neutral state during September 2017. The upper-level circulation pattern underwent a significant shift over the contiguous United States (CONUS) at mid-month, changing from a predominantly ridge-West/trough-East pattern during the first half of the month to a trough-West/ridge-East pattern for the last half... Read more »
  • September 2017 Wildfires
    For September, 3,033 fires (2nd least since 2000) burned 1,325,423 acres (2nd most on record), which is 437.0 acres burned/fire (most on record). For January - September, 49,526 fires (6th least since 2000) burned 8,464,884 acres (4th most on record), which is 170.9 acres burned/fire (3rd most on record).... Read more »
  • September 2017 Hurricanes and Tropical Storms
    September was an extremely active hurricane month for the North Atlantic Basin with five hurricanes — four of which were major hurricanes. Two Hurricanes, Irma and Maria each reached category 5 strength. One measure of tropical cyclone activity — the Accumulated Cyclone Energy (ACE) index, which takes into account the... Read more »
  • September 2017 Tornadoes
    This analysis is based on preliminary data available from the Storm Prediction Center. Final tornado counts published by the Storm Prediction Center and NCEI's Storm Events Database might differ from this report. For a more detailed climatology, please visit our tornado climatology page.... Read more »
  • September 2017 Global Snow and Ice
    During September, the Northern Hemisphere snow cover extent (SCE) was 0.00 million square km (0.00 million square miles), 100.00% below the 1981-2010 average. The global sea ice extent was 22.90 million square km (8.84 million square miles), 9.74% below the 1981-2010 average.... Read more »