NP Index is the area-weighted sea level pressure over the region 30N-65N, 160E-140W.
Time Interval: Monthly
Time Coverage: 1899 to Sep 2015
Update Status: Periodically updated
Data is from NCAR/CGD at https://climatedataguide.ucar.edu/climate-data/north-pacific-np-index-trenberth-and-hurrell-monthly-and-winter.
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NOAA ESRL Physical Sciences Division
Document maintained by Cathy Smith (email@example.com)
Updated: Dec 30, 2015 14:12:21 MST