Fig.1

The spatial distribution of 204 selected meteorological stations in Northeast China"

Fig.2

Time series (a) and M-K mutation test (b) of summer precipitation in Northeast China from 1961 to 2019"

Fig.3

Climate states (a) and precipitation trend (b) distribution of summer precipitation in Northeast China from 1961 to 2019"

Fig.4

The difference between phase 2 and phase 1 (a) and phase 3 and phase 2 (b) of summer precipitation in Northeast China from 1961 to 2019"

Fig.5

Wavelet power spectrum of time series of summer precipitation in Northeast China from 1961 to 2019"

Fig.6

Precipitation trends of light rain (a), moderate rain (b), heavy rain (c) and rainstorm (d) in summer in Northeast China from 1961 to 2019"

Fig.7

Precipitation contribution rates of light rain (a), moderate rain (b), heavy rain (c) and rainstorm (d) in summer in Northeast China from 1961 to 2019"

Table 1

Correlation coefficients between summer precipitation and previous Niño3.4 index in Northeast China"

Fig.8

21 a and 23 a sliding correlation coefficients between summer precipitation and Niño3.4 index in the previous summer in Northeast China from 1961 to 2019"

Table 2

Significance related statistics between summer precipitation and Niño3.4 index in the previous summer in Northeast China from 1961 to 2019"

Fig.9

The standardized Niño3.4 index in the previous summer from 1961 to 1996 (a) and 1997 to 2019 (b), and regression field between summer precipitation and 500 hPa potential height in Northeast China from 1961 to 1996 (c) and 1997 to 2019 (d)"

Fig.10

Regression field between the standardized Niño3.4 index in the previous summer and total layer water vapor flux from 1961 to 1996 (a), 1997 to 2019 (b), and water vapor flux divergence from 1961 to 1996 (c) and 1997 to 2019 (d)"