Have a look in the relevant skin.conf under [ImageGenerator] and then look at the aggregate_type and aggregate_interval config options under each [[ ]] stanza. By default the plots for week and longer periods plot an average (set by aggregate_type config option) calculated over the aggregate_interval period. For week this is a one hour average, month is a three hour average and year is a one day average (day plots plots do no averaging). Consequently week, month and year plots of data such as UV and radiation can appear to display low values.
One of the main reasons for this approach is to avoid excessive processor loads/times when generating large plots. For a 5 minute archive period one day consists of 288 data points, for a one year plot this would be over 100 000 data points if there was not some sort of aggregation being used. As mentioned you can change aggregate_type to plot the maximum value if you want a more realistic plot. Have a read of The image generator section in the Customization Guide (http://weewx.com/docs/customizing.htm#image_generator) Gary -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/79a9d66c-c1ea-4576-9313-e5accff131b7%40googlegroups.com.
