Fig. 2: Box plot analysis of precipitation in June and July.

Precipitation averages over the northern (a) (26°N-33°N, 105°E−122°E, as red box in Fig. 1c) and southern (b) (21°N-26°N, 105°E−120°E, as blue box in Fig. 1c) regions in June. Precipitation averages over the northern (c) (33°N-40°N, 107°E−120°E, as red box in Fig. 1d) and southern (d) (21°N-30°N, 107°E−120°E, as blue box in Fig. 1d) regions in July. The box plot represents the maximum value, upper quartile, median, lower quartile, and minimum value, while the dots indicate the area-averaged precipitation of the ensemble mean.