Scorching
temperatures in June's second half helped the continental United
States break its record for the hottest first six months in a calendar
year, the National Oceanic and Atmospheric Administration said on
Monday.
The last 12 months also have been the warmest since modern
record-keeping began in 1895, narrowly beating the previous 12-month
period that ended in May 2012.
Every state except Washington in the contiguous United States had
warmer-than-average temperatures for the June 2011-June 2012 period.
The recent blistering heat wave broke records across much of the
United States, threatening the Midwest's corn crop and helping to fan
destructive wildfires.
June was 2 degrees Fahrenheit (1.1 degrees Celsius) warmer in the
lower 48 states than the 20th-century average, but still just the 14th
hottest June in the record books, NOAA's National Climatic
Data Center said in a statement.
June 1933, during the calamitous Dust Bowl period, was the hottest.
More than 170 all-time warm records were broken or tied during June's second half, NOAA said.
Temperatures in South Carolina and Georgia of 113
degrees
F (45 degrees C) and 112 degrees F (44 degrees C) respectively are
under review as possible all-time statewide temperature records.
Such record-high temperatures are in line with a long-term warming
trend in the 48 contiguous states, said Jake Crouch, a scientist at the
National Climatic Data Center.
Climate change spurred by carbon dioxide emissions may not be the
primary cause, but these extreme conditions are consistent with what
scientists see as a "new normal," Crouch said by telephone.
"It's hard to pinpoint climate change as the driving factor, but it
appears that it is playing a role," he said. "What's going on for 2012
is exactly what we would expect from climate change."
CORN YIELD AT RISK
This past month was also the 10th driest June, with drought spreading
to 56 percent of the contiguous U.S. states, up from 37.4 percent in
May, making it the largest drought footprint of the 21st century.
The heat and drought put pressure on the corn crop, with analysts
suggesting that theU.S. Department of Agriculture should lower its yield
forecast in a monthly report due on Wednesday.
In early June, before the highest temperatures hit the U.S. grain
belt, USDA forecast a record-large yield of 166 bushels per acre. Since
then, hot, dry weather has baked much of the corn-growing region just
as the crop was starting pollination, the key growth phase for
determining yield.
Wildfires claimed 1.3 million acres, mostly in the West, the second-largest area to be charred during any June on record.
But it wasn't all dry. Tropical Storm Debby dumped so much rain
during its slow pass across Florida that the state's monthly statewide
precipitation total for the month was 13.16 inches, or 6.17 inches
above average, making it Florida's wettest June on record.
Maine, Oregon and Washington state each had a top-10 wet June.
A broader look at global weather conditions for 2011 by U.S. and
British scientists is set for release on Tuesday by NOAA and theUnited
Kingdom's Met Office.
(Additional reporting by Julie Ingwersen in Chicago; Editing by Xavier Briand)
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