Climatological Frequency of Sudden Stratospheric Warming (SSW) | |||
Period | 1958-2015 | Period 1 1966-1990 | Period 2 1991-2015 |
Number of years | 58 | 25 | 25 |
Years with SSW events | 36 | 16 | 16 |
Number of SSW events | 47 | 22 | 19 |