Figure 1
From: Characteristics of the Northern Hemisphere cold regions changes from 1901 to 2019

(a) Interannual and (b) tri-decadal variations and (c) anomalies in the spatial extent of the cold regions in the NH from 1901 to 2019.
From: Characteristics of the Northern Hemisphere cold regions changes from 1901 to 2019

(a) Interannual and (b) tri-decadal variations and (c) anomalies in the spatial extent of the cold regions in the NH from 1901 to 2019.