Table 1 The top six maximum and minimum months of the AOI from 1900 to 2015.

From: Volcanic activity sparks the Arctic Oscillation

AOI positive phase

Year.month

1993.01

1989.01

1990.03

1959.02

1957.01

2007.01

1951.12

AOI anomaly value

4.162

3.717

3.445

3.157

2.825

2.734

2.308

AOI negative phase

Year.month

2010.02

1977.01

1962.03

1969.01

1966.01

2000.12

1970.03

AOI anomaly value

− 3.566

− 3.279

− 2.986

− 2.979

− 2.802

− 2.222

− 2.118

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