December was dry, less than half the typical rainfall, but then again October was very wet. 2018 saw very erratic rain conditions, far from typical.
The heavy blue verticals are the daily rainfall as shown on the left and right scales.
The 4 lines are all /5 scale, to show a more meaningful indication.
The small dotted dark line is the Typical monthly rain averages.
The dashed dark line is the actual monthly averages for 2018, high in Jan, Feb and Oct, and low in Jun, Jul, Sep, Dec.
The light Blue line is effective water in the ground that all plants can access.
The light Green line is deeper water that deep rooted plants can access, and is slower to change.