



Of the 9 climate regions, 4 were cooler than normal: East North-Central, Central, West North-Central, and South. The South was the coolest at -2.5°. However, the Northeast and West were each 5° or more warmer than average.
Preliminary data for September show that the month averaged 1.8° above normal, vs. 1.2° for August. The fully-adjusted NCDC result for September, posted a few minutes ago, was 1.4° above the 20th century average:
The average contiguous U.S. temperature during September was 67.0°F, 1.4°F above the 20th century average, tying September 1980 as the 23rd warmest such month on record. September 2012 marks the 16th consecutive month with above-average temperatures for the Lower 48.The warm season of April-September was the warmest on record:
The contiguous U.S. warm season, defined as the six-month period from April-September, had temperatures that were record warm. The six-month average temperature of 68.2°F for the Lower 48 was 2.6°F above average. The previous warmest April-September occurred in 1934 when the nationally-averaged temperature was 67.6°F.It was also the warmest year-to-date and 12-month period of October-September:
The January-September period was the warmest first nine months of any year on record for the contiguous United States. The national temperature of 59.8°F was 3.8°F above the 20th century average, and 1.2°F above the previous record warm January-September of 2006. During the nine-month period, 46 states had temperatures among their ten warmest, with 25 states being record warm. Only Washington had statewide temperatures near average for the period.
The October 2011-September 2012 period was the warmest such 12-month period on record for the contiguous U.S., with an average temperature of 56.2°F, 3.2°F above average. This 12-month temperature average tied the June 2011-May 2012 period as the 3rd warmest of any 12-month period. The six warmest 12-month periods have all ended during 2012.
Images (click to enlarge):
- Weekly average U.S. temperature departures from normal, weeks ending June 4, 2011 (20110604) through October 6, 2012 (20121006); CapitalClimate chart from NOAA/NCDC data
- Weekly average NWS station temperature departures from normal, week ending October 6, 2012; stations listed alphabetically by state and 3-character station identifier; CapitalClimate chart from NWS data
- Average U.S. temperature departure from normal for September 30-October 6, 2012
from High Plains Regional Climate Center
- Average U.S. temperature January-September, 1895-2012, from NCDC
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