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In 2013, the contiguous United States (CONUS) average temperature of 52.4°F was 0.3°F above the 20th century average, and tied with 1980 as the 37th warmest year in the 119-year period of record. The 2013 annual temperature marked the coolest year for the nation since 2009. The 2013 CONUS average temperature was 2.9°F cooler than the 2012 average temperature, which was the warmest year on record for the nation. Since 1895, when national temperature records began, the CONUS has observed a long-term temperature increase of about 0.13°F per decade. Precipitation averaged across the CONUS in 2013 was 31.17 inches, 2.03 inches above the 20th century average. This marked the 21st wettest year on record for the nation and the wettest since 2009. Compared to 2012, which was the 18th driest year on record, the CONUS was 4.50 inches wetter in 2013. Over the 119-year period of record, precipitation across the CONUS increased at an average rate of 0.17 inch per decade.
On a statewide and seasonal level, 2013 was a year of precipitation extremes, with temperature extremes being more muted than the previous year. Above-average temperatures during 2013 were observed in parts of the West, Northeast, and in Florida. No state had annual temperatures that ranked among the ten warmest. California tied its 12th warmest year with a statewide average temperature of 60.3°F, 1.4°F above average. Below-average annual temperatures were observed from the Northern Plains, through the Central Plains and Midwest, and into the Southeast. No state had annual temperatures that ranked among the ten coolest. Despite no state having a record warm or cool year, numerous locations across California and Florida had their warmest year on record, while numerous locations across the Plains and Mid-South had their coolest year on record. A map of those stations is available here. Based on NOAA’s Residential Energy Demand Temperature Index (REDTI), the contiguous U.S. temperature-related energy demand during 2013 was 7 percent above average and ranked as the 49th lowest in the 1895-2013 period of record. On a local level during 2013, approximately 26,100 daily warm temperature records were tied or broken (10,100 warm daily maximum records and 16,000 warm daily minimum records); while approximately 28,800 daily cool temperature records were tied or broken (16,900 cool daily maximum records and 11,900 cool daily minimum records).
Overall, much of the CONUS was wetter than average for the year, particularly east of the Rockies. The largest precipitation departures from average were observed in the Northern Plains, the Upper Midwest, and the Southeast. In total 10 states had annual precipitation totals that ranked among the ten wettest years on record. Michigan had its wettest year on record with 40.12 inches of precipitation, 8.9 inches above average. This bested the previous record wet year of 1985 by 0.64 inch. North Dakota also had its wettest year on record with 24.54 inches of precipitation, 7.18 inches above average. This bested the previous record wet year of 2010 by 0.29 inch. In contrast, portions of the West were dry. California had its driest calendar year on record with 7.38 inches of precipitation, 15.13 inches below average. This was 2.42 inches below the previous record dry year of 1898. By the end of 2013, 27.6 percent of California was in Severe Drought. To the north, Oregon had its fourth driest year, while Idaho had its 12th driest. Numerous locations across the Southeast, Midwest, Northern Plains, and Rockies experienced their wettest year on record, while locations in California, Idaho, and Washington had their driest. A map of those stations is available here. In term of drought, according to the U.S. Drought Monitor, conditions improved across much of the southeastern and central U.S. during 2013, but deteriorated in the Far West and Northeast. At the end of 2013, about 31.0 percent of the contiguous U.S. was experiencing drought, down from 61.1 percent at the beginning of the year.