Thursday, October 24, 2013

September 2013 Statewide Temperature and Precipitation Rankings

September 2013 Statewide Temperature and Precipitation Rankings
Nebraska had its 7th warmest September on record (on the map 113th coldest September out of 119 years of data).  Iowa to Colorado and up north into SD, ND, MT, ID and WA all had a "much warmer than Normal" September 2013.  The only states with below normal temperatures in September 2013 were New York, Pennsylvania, New Jersey and Maryland.

Nebraska experienced above normal precipitation during September 2013 and just to our west and north Colorado had its wettest September on record.  Washington state and Oregon also had their wettest September on record.  In contrast, just to our east the upper Midwest had below normal precipitation during September 2013.  The southeastern U.S. also had below normal precipitation in September 2013 and the Maryland Delaware region had a top ten driest September on record.

TWO MAPS are located just below the U.S. Highlights

  • U.S. Climate Highlights — September
  • The average temperature for the contiguous U.S. during September was 67.3°F, 2.5°F above the 20th century average — the sixth warmest September on record.
  • The West, Great Plains, and much of the Gulf Coast were warmer than average during September. Seven states in the Northern Rockies and Northern Plains experienced a top 10 warm September — Idaho, Montana, Wyoming, Colorado, North Dakota, South Dakota, and Nebraska.
  • In the East, near-average and below-average September temperatures were observed. No state had September temperatures that ranked among the 10 coolest on record.

  • The nationally-averaged precipitation total for September was 2.99 inches, 0.51 inch above average, tying with 2004 as the 12th wettest September on record.
  • Above-average precipitation was widespread across the West. Colorado, Oregon, and Washington each had their wettest September on record. Seven additional states, from New Mexico to North Dakota, had September precipitation totals that ranked among the 10 wettest on record.
  • Between September 9th–16th, a cut-off low pressure system situated over the Great Basin pumped deep tropical moisture into the Colorado Front Range, resulting in record-breaking precipitation. The heaviest precipitation totals were reported in and around Boulder, Colorado, where 9.08 inches accumulated on September 12th alone, setting a new 24-hour precipitation record for the city. Boulder also broke its monthly and annual precipitation records due to the event. Streams and rivers approached and exceeded record levels with widespread flooding reported. Additional information on this flooding event can be found here:
  • Below-average precipitation was observed across the Western Great Lakes, as well as the Mid-Atlantic, and coastal Southeast. Delaware and Maryland both had a top 10 dry September.

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