U.S. Climate Extremes Index (CEI): Graph
NCDC added Alaska climate divisions to its nClimDiv dataset on Friday, March 6, 2015, coincident with the release of the February 2015 monthly monitoring report. For more information on this data, please visit the Alaska Climate Divisions FAQ.
Choose a period/season and an indicator from the options below and click "Plot" to create a time series graph. Note that the sixth indicator (Step 6) is not calculated for the spring (March-May), winter (December-February) and cold (October-March) seasons since most months during these periods are outside of the traditional hurricane season.
Move mouse towards an axis until highlighted. Left-click mouse to pan. Shift key + left-click to zoom.
**As of December 2005, landfalling wind speeds in the sixth indicator are determined using the following logic:
- For landfalls prior to 1915: Use wind speed observation prior to landfall as landfalling windspeed.
- For landfalls from 1915 to 1930: Use wind speed observation prior to landfall if observation was at 12Z. Otherwise use midpoint windspeed value from assigned landfalling Saffir-Simpson Scale.
- For landfalls from 1931 to 1979: Use wind speed observation prior to landfall if observation was at either 0Z or 12Z. Otherwise use midpoint windspeed value from assigned landfalling Saffir-Simpson Scale.
- For landfalls from 1980 to the present: Use estimated landfalling windspeed as reproted in the Tropical Cyclone Reports issued by the National Hurricane Center.
Limitations: Statistics for the most recent period/season are computed from a fraction of the U.S. which has data available at that time. Extreme percentage values can and will likely change as final quality controlled data become available and fill in the data gaps.