Contact: John Leslie FOR IMMEDIATE RELEASE
301-713-2087, ext. 174 May 7, 2010
NOAA: Above-Normal Temperatures and Below-Normal Precipitation in April
NOAA’s State of the Climate report shows the April 2010 average temperature for the contiguous United States was 54.3 degrees F, which is 2.3 degrees F above the long-term (1901-2000) average (14th warmest April on record). April’s average precipitation was 2.18 inches, 0.25 inch below the 1901-2000 average.
Based on a 116-year record since 1895, this monthly analysis prepared by scientists at NOAA’s National Climatic Data Center in Asheville, N.C., is part of the suite of climate services NOAA provides.
U.S. Temperature Highlights
The generally warm and dry influence of persistent high-pressure areas brought above-normal temperatures to most states east of the Rocky Mountains. Only three states (California, Nevada and Oregon) had cooler-than-average temperatures in April.
Regionally, both the Northeast and the East North Central Region near the Great Lakes, which includes; Minnesota, Iowa, Wisconsin and Michigan – experienced their second warmest April on record. The Central climate region, which includes the states of West Virginia, Tennessee, Kentucky, Ohio, Indiana, Illinois and Missouri was also saw above-normal temperatures, resulting in the fourth warmest April for that region. [regional map http://www.ncdc.noaa.gov/img/climate/research/usrgns_pg.gif]
Record warmth prevailed in Illinois and the northeast, namely Maine, Connecticut, Rhode Island and New Jersey, each of which had its warmest April on record. In total, 31 states had above-normal temperatures.
The three-month period (February-April) was the record warmest in six states; Maine, Vermont, New Hampshire, Massachusetts, Connecticut and Rhode Island.
Maine, Vermont and New Hampshire each also had their warmest year-to-date (January-April) period on record. Conversely, Florida had its coolest, while South Carolina, Georgia, Alabama, Mississippi, Louisiana and Texas average temperature ranked among their 10 coolest.
The cooler-than-normal temperatures that prevailed during the latter part of the winter season in the south and southeast were still evident in the three-month (February-April) period. Florida had its coolest such period, while Louisiana and Alabama had their sixth coolest, Georgia its seventh coolest and both Mississippi and Texas their eighth coolest February-April.
U.S. Precipitation Highlights
April precipitation in most areas east of the Mississippi River was below average. Wetness returned to the West Coast, as the Northwest climate region averaged much-above-normal precipitation.
Many Mid-Atlantic states observed much-below-normal precipitation. Both Louisiana and South Carolina experienced their sixth driest April. It was also abnormally dry in Connecticut (eight), North Carolina (ninth), Virginia (ninth) and Maryland (tenth). Conversely, it was Oregon’s tenth-wettest April on record.
The dryness in Michigan has persisted throughout 2010, becoming the second driest January-April period on record. The year-to-date period was also the seventh driest for Wisconsin and Kentucky and the eighth driest for Louisiana.
NCDC’s preliminary reports, which assess the current state of the climate, are released soon after the end of each month. These analyses are based on preliminary data, which are subject to revision. Additional quality control is applied to the data when latereports are received several weeks after the end of the month and as increased scientific methods improve NCDC’s processing algorithms.
NOAA understands and predicts changes in the Earth's environment, from the depths of the ocean to the surface of the sun, and conserves and manages our coastal and marine resources. Visit us at http://www.noaa.gov or on Facebook at http://www.facebook.com/usnoaagov.
On the Web:
NOAA’s National Climatic Data Center: http://www.ncdc.noaa.gov
NCDC April 2010 analysis: http://www.ncdc.noaa.gov/sotc/