What a difference a year makes

....What a difference a year makes...
...July 2010 could end in the top 10 hottest on record...
...July 2009 was the 4th coolest July on record...

Bobby Boyd
National Weather Service
Nashville, Tennessee


July 2010 has been one of the hottest July's in recent years (3 degrees above normal through the 23rd) and could end as one of the top 10 hottest on record. The hottest temperature so far this month in Nashville has been 98 degrees on the 8th. July 2010 will likely end up with 25 days of 90 degrees and above...the most since 1993 which ended with 28 days. The hottest July on record in Nashville was back in 1954 which was 5 degrees above normal. In July 1954 there were 30 days of 90 degrees and above...the most ever recorded in the month of July. The reason for the persistent hot weather this month has been an upper level high that has remainded over the south for much of the summer.  The upper ridge has also kept the storm track well to the north of Middle Tennessee. 

One year ago July 2009 was the 4th coolest July on record and the coolest since 1967. The highest temperature during the entire month of July 2009 was 92 degrees.  The lowest temperature was 57 degrees.  There were six lowest daily temperature records either tied or broken. There were only 4 days during the month in which the temperature reached or exceeded the 90 degree mark. This tied the all-time record also set in 1967 for the fewest days with 90 degrees and above during the month of July. The reason for the unusually cool July was a persistent upper level trough across the eastern third of the United States.




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