The graphs are capable of displaying monthly average data. This can be seen as a green line on the charts, as shown in the example chart to the left.
The average data is statically defined for the specific rain gauge. It is not calculated from the data recorded for the gauge. This allows you to compare your actual rainfall to historical information obtained from another source, i.e. your local weather bureau.
To enter your historical averages, look for the "Monthly Averages" link from the main page stations listing details (available when you are logged in). The link to use should look like the the image to the right:
From there all you need to do is enter your rainfall amounts for each month of the year and hit the update button, as shown in the following example:
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