When the difference between max and min temperature
is small, the datalabel can overlap each other.
To avoid it, the datalabel postion for min temperature is changed
to bottom, and the y-axis range is adjusted not to overlap with
datalabels for rain volume.
mtatsuma
commented
3 years ago 
When the difference between max and min temperature is small, the datalabel can overlap each other.
To avoid it, the datalabel postion for min temperature is changed to bottom, and the y-axis range is adjusted not to overlap with datalabels for rain volume.
Related issue: https://github.com/mtatsuma/MMM-WeatherChart/issues/15