Spatial Variability and Periodicity of Precipitation in the Middle Reaches of the Yellow River, China

Table 2

Statistics for annual precipitation (), precipitation of flood season (), and precipitation of main flood season () of the Middle Yellow River from 1958 to 2013.

Statistic	(mm)	(mm)	(mm)
Mean	499.9	383.3	211.0
Minimum	335.3	231.1	103.9
(Year)	(1997)	(1997)	(1991)
Maximum	758.1	549.1	345.0
(Year)	(1964)	(1964)	(1958)
Median	487.0	373.5	214.4
Standard deviation	82.9	72.8	53.6
Confidence levels (95.0%)	22.20	19.49	14.30
Coefficients of variation	0.166	0.190	0.254