Understanding Climate

High-tide "nuisance flooding" has increased between 300 and 925 percent since the 1960s as a result of sea level rise. In this Q&A, Billy Sweet and John Marra explain the changes and offer projections for the remainder of the 2015-16 monitoring year.

April 2012

  • Temperature anomaly map

    Record and near-record breaking temperatures dominated the eastern two-thirds of the nation and contributed to the warmest March in the contiguous United States since records began in 1895. The average temperature was 8.6 degrees above the 20th century average for March. In the past 117 years, only one month (January 2006) has ever been so much warmer than its average temperature.