Fig.1

Spatial distribution of 245 weather stations in Northeast China"

Fig.2

Spatial distributions of accumulative precipitation in early summer (a) and mid-summer (b) in Northeast China from 1961 to 2019"

Fig.3

Spatial patterns of the first (a), second(b), third(c), and fourth(d) EOF modes of early summer precipitation in Northeast China"

Fig.4

Spatial patterns of the first (a), second (b), third (c), and fourth (d) EOF modes of mid-summer precipitation in Northeast China"

Fig.5

Interannual changes of precipitation in early summer (a) and mid-summer (b) in Northeast China during 1961 to 2019"

Fig.6

Cumulative anomaly curves of precipitation in early summer (a) and mid-summer (b) in Northeast China during 1961 to 2019"

Fig.7

Statistic curves of moving t-test of precipitation in early summer (a) and mid-summer (b) in Northeast China during 1961 to 2019"

Fig.8

Wavelet coefficients and wavelet variance of precipitation in early summer (a) and mid-summer (b) in Northeast China from 1961 to 2019"

Fig.9

Correlation coefficients between the 500 hPa height field and the standardized time series of precipitation in early summer during 1972-1995(a) and 1996-2019(b) in Northeast China"

Fig.10

Correlation coefficients between the 850 hPa (a, b), 200 hPa (c, d) height fields and the standardized time series of precipitation in early summer during 1972-1995(a, c) and 1996-2019(b, d) in Northeast China"

Fig.11

Spatial distribution of correlation coefficients between the 500 hPa height field and the standardized time series of precipitation in mid-summer during 1966-1983(a), 1984-1998(b) and 1999-2019(c) in Northeast China"

Fig.12

Spatial distribution of correlation coefficients between the 850 hPa (a-c), 200 hPa (d-f) wind fields and the standardized time series of precipitation in mid-summer during 1966-1983(a, d), 1984-1998(b, e) and 1999-2019(c, f) in Northeast China"