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FAQ: Difference between revisions
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→The peak values on my graphs are not the same as my extreme values
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== The peak values on my graphs are not the same as my extreme values ==
The graphs are snapshots of the data, taken once a minute while Cumulus is running; it is not feasible to plot every data point. If the extreme value did not coincide exactly with the point at which the data was added to the graph, then it will not appear on the graph. The graphs are not intended to show all of the highs and lows, they are there to give an idea of the trends. This also applies to 'Select-A-Graph', which takes its data from the data logs; the highs and lows do not necessarily appear in the periodic data logs.
This is most noticeable with wind gusts, the value of which can change rapidly, even over a period of a minute. The 'Plot latest gust' setting causes the 'Latest' figure (as shown on the main screen) to be plotted. What this figure represents exactly depends on your weather station type. This figure may vary rapidly, e.g. on Davis stations, it changes every 3 seconds or so. The graphs are plotted once a minute, and hence, with Davis stations, for example, there is approximately a one in 20 chance of any given 'latest' figure actually being plotted.
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