Climate Highlights — September 2011
•During September, a persistent upper-level weather pattern brought above-average temperatures to the western third of the country, below-average temperatures to the central United States, and above-normal temperatures to the Northeast.
•The average U.S. temperature in September was 66.9 degrees F (19.4 degrees C), which is 1.5 degrees F (0.8 degrees C) above the long-term (1901-2000) average. •Above-normal temperatures dominated the western United States, with five states — California, Idaho, Nevada, Oregon, and Washington — having one of their ten warmest Septembers on record.
•A persistent upper-level low pressure system was associated with 14 states having below-normal September temperatures across the central United States. Mississippi tied its ninth coolest September on record.
•Eight states in the Northeast had September temperatures among their ten warmest — Connecticut, New Hampshire, New Jersey, New York, Maine, Massachusetts, Rhode Island, and Vermont