[hahy-et-uh-graf, -grahf, hahy-i-tuh-]
a map or chart showing the average rainfall for the localities represented.

hyeto- + -graph

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World English Dictionary
hyetograph (ˈhaɪɪtəˌɡrɑːf, -ˌɡræf)
1.  a chart showing the distribution of rainfall of a particular area, usually throughout a year
2.  a self-recording rain gauge

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Example sentences
Lag time is usually defined as the time from the center of the rainfall hyetograph to the centroid of the hydrograph.
It then matches the rainfall to this hydrograph by comparing the times of occurrence of both the hydrograph and the hyetograph.
The hyetograph for the storm was derived from the chart of a recording rain-gaging station on the water shed.
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