I think the issue is simply one of forecasting precisely 25.4mm of rain seems wrong since forecasts are never issued to tenths of mm. Not sure there is much you can do about it, it's a fact of converting inches to mm, you could change the precision of what is displayed, might look ok. 2 inches would display as 51mm which may or may not be just as a nappealing. Otherwise find a forecast source that is in your preferred units I guess.
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