As detailed by the National Oceanic and Atmospheric Administration's Geophysical Fluid Dynamics Laboratory, the full record of U.S. hurricane strikes actually shows "a slight negative trend beginning from 1900 or from the late 1800s." Counting only major hurricanes (Category 3, 4, 5), the trend has been generally flat for 165 years. Likewise, for as far back in time as reliable data extends, global hurricane frequency, hurricane intensity, hurricane duration, and general rainfall trends have been level.