It is important to note that while some of the graphs above go down at the start but later go up, this is due mostly to in- flows from a water supply that only recently came out of red alert. 
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That said, it is not impossible that these rises are also due to warmer weather however our assumption that it is mostly due to inflows is due to the fact that some new species have appeared at the very same time as these counts have increased suggesting that the inflows of contaminated water is the main reason for these increases.
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Hence watching these graphs and their progress overall is of most importance while noting the overall algae count will be relieving the filtration plant that this water has to go through before going to homes.
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The other important thing to note, is if a species drops between inflows, it is assumed that this is as a result of the ultrasonics doing its job, yet a drop in count can also be contributed to decreased water temperature or seasonal change, however this decline is usually slow.