Fig. 6

Temporal and spatial distribution of our precipitation dataset. (a) Annual precipitation deviation [mm/year] compared to JMA point data averaged over Japan. Hokkaido is excluded in our calculation due to lack of data in earlier periods. Mean annual precipitation [mm/year] of our dataset for the periods (b) 1926–1975 and (c) 1976–2020. Gray shaded area is not included in the FLOW river network for Japan. White area is where interpolation was not conducted mainly due to lack of observations nearby.