I doubt if it can be done by a simple change as it appears to depend on ozone thickness, cloud thickness, time of year and station elevation.
However, if you know what it should read then provided it is a value sent raw from the station, and is not derived within weewx, you can just say UV = UV - 15 (if you want to just subtract 15 from the value supplied) or UV = UV / 15 if you want to divide the value by 15 - going to your original post maybe it should be UV = UV / 256 - which would probably give 0 at night (if weewx is reporting 15) Guess you should give some examples of UV on console and UV in weewx to be able to derive a calibration formula On Wednesday, 11 April 2018 10:04:26 UTC+3, Damjan Hajsek wrote: > Anyone know what to use in > [StdCalibrate] > > [[Corrections]] > > to correct UV index? Because now at night it is UV = 15 > > > > Dne sreda, 08. november 2017 09.56.35 UTC+1 je oseba Damjan Hajsek > napisala: >> >> What is relation with UV index and radiation? >> Because sometimes radiation is already 0 but UV index is still about 80 >> or 50. >> Doesn't that be also 0 when radiation is 0? >> >> -- 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 weewx-user+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
