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Warmer national, global temperatures
for December    
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[JAN. 17, 2005]  The national average temperature for December 2004 was above normal for the contiguous United States, according to scientists at the National Oceanic and Atmospheric Administration's National Climatic Data Center in Asheville, N.C. While much of the western half of the nation was warmer than average, a brief period of very cold temperatures and heavy snowfall occurred in the Midwest and parts of the South, where temperatures averaged near the long-term mean (1895-2003). The global average temperature for December was fifth-warmest on record.

NOAA scientists report that the average temperature for the contiguous United States for December, based on preliminary data, was 35.7 F (2.1C), which was 2.2 F (1.2 C) above the 1895-2003 mean. This was the 23rd-warmest December on record. The mean temperature in 19 states was above average, with all but one (New Hampshire) of those states being west of the Mississippi River. Three western states (Montana, Wyoming, Nebraska) were much warmer than the long-term mean, while only two states in the contiguous United States (Mississippi, Louisiana) were cooler than average for the month.

The relatively warm temperatures for the nation led to below-normal heating degree days and below-average residential energy demand. The nation's Residential Energy Demand Temperature Index was the 35th-lowest on record for December.

The December temperature ranking of 23rd-warmest is close to that for all of 2004 as a whole, which ended as the 24th-warmest year on record.

Alaska was warmer than average for December, with a statewide temperature of 4.5 F (2.5 C) above the 1971-2000 mean. The year as a whole was much warmer than average for Alaska, ranking as the fourth-warmest since statewide records began in 1918.

December precipitation was near average for the nation overall; however, dryness in the central part of the country balanced above-average wetness in the Southwest and Northeast.

The last few months of 2004 and the year as a whole were much wetter than average, with the year ending as the sixth-wettest on record. The latter half of 2004 ranked second-wettest for any July-December in the last 110 years, partly as a result of multiple land-falling tropical systems and much-above-average rain and snowfall in areas of the Southwest.

The wetter-than-average conditions in parts of the West in 2004 helped alleviate drought that has been entrenched for more than five years in some western locations. Although hydrological deficits still remain in much of the West, moderate-extreme drought affected only 10 percent of the western United States at the end of December, based on a widely used measure of drought, the Palmer Drought Index. This compares with 69 percent in March of 2004, the peak of the 2004 drought.

After a relatively slow start to the 2004-05 winter season for many parts of the country, a major snowstorm affected much of the Midwest in late December, causing major disruptions throughout the region. Some cities in the Midwest received more than their annual average snowfall in a single day. Residents in cities such as Paducah, Ky., and Evansville, Ind., had snow totals exceeding a foot, with over 2 feet being reported in places such as Scottsburg, Ind., and across a large area of the western Ohio Valley. Snowfall was also recorded in Brownsville, Texas, for the first time since February 1895, with 1.5 inches falling on Christmas Day. Farther north, Victoria, Texas, received over a foot of snow from the same storm, a record for the city.

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The average global temperature anomaly for combined land and ocean surfaces during December 2004, based on preliminary data, was 0.79 F (0.44 C) above the 1880-2003 long-term mean. This was the fifth-warmest December since 1880, the beginning of reliable instrumental records.

Although land-surface temperatures were anomalously warm throughout Europe, Scandinavia and western North America, cooler-than-average conditions were widespread across eastern and northern Canada as well as much of Asia.

Weak El Niņo conditions persisted into December, with sea-surface temperatures in much of the central and east-central equatorial Pacific remaining warmer than average for the month, and the December global ocean-surface temperature was second-warmest on record.

The warmer-than-average December concludes another much-warmer-than-average year for the globe: fourth-warmest since 1880.

NOAA's Satellite and Information Services is America's primary source of space-based oceanographic, meteorological and climate data. It operates the nation's environmental satellites, which are used for ocean and weather observation and forecasting, climate monitoring, and other environmental applications. Some of the oceanographic applications include sea-surface temperature for hurricane and weather forecasting and sea-surface heights for El Niņo prediction.

NOAA, an agency of the U.S. Department of Commerce, is dedicated to enhancing economic security and national safety through the prediction and research of weather and climate-related events and providing environmental stewardship of the nation's coastal and marine resources.

On the Web:

[National Oceanic and Atmospheric Administration news release]

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