@dsj
Oh yes much better. 
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Hi I have checked my stations 4664 UV against the official ones at
Canberra and found that they are showing about half of what I would expect them to be.
Canberra lies about 150km to the south and has similar weather conditions to our area. eg yesterday Canberra max UV 11.1 @ 13:23 mine 6.8 @14:00, a very long way out
Information for Australian conditions can be found here https://www.arpansa.gov.au/our-services/monitoring/ultraviolet-radiation-monitoring/ultraviolet-radiation-index
The graphs are updated every minute
Regards
Thanks. The readings now look more like I expect.
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Thanks for the report, John. Your station is one of hundreds that just received an adjusted calibration under the latest iteration of the CL process for UV mentioned above. You should see better UV data starting today!
Thanks also for the link to the Australian UV info. Good stuff!
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Thanks David I’ll keep an eye on it and let you know
Thought you might like a link to the Au UV site as it might help to calibrate the Skys in Oz
Hi Ian. Thanks for the report. Your calibration was indeed recently updated, but not enough to explain that big increase! We’re going to take a look at your debug data - something else may be going on here. Stay tuned.
Hi @dsj I agree with @iladyman it looks to me that the readings may be up to 3 points too high.
I would not have expected a reading of 17+ in these latitudes according to the predicted ones of 14 max, (a bit hard to tell out here as we are not real close to a working station) although it was a very bright day.
Yes, I think ~17 is too high even for the AUS/NZ summer!
We’ve confirmed this is not related to the auto-calibration process. Rather, it looks like a case of spurious “spikes” in the readings. We’re going to pull out the solar simulator and run some tests to try and figure out what’s going on. Thanks for the reports!
Thanks David, looking forward to the results.
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Last days where great to check the UV readings.
Bright sunny days.L
Good to say that the Sky is measuring exactly the same UV as what is expected for this region in February.
I think the calibration did a great job.
Calibrated my WS-2000 to the same measurements as the Sky.
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Over here the UV seems now a little too low I’ve UVI 1 clear skies and RIVM measures 1.5
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Last days I got exactly 1.5 to 1.7 UV.
So that’s spot on. 
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Seems to be good now max UV was 1.6 same as measured by RIVM also the solaradiation seems in line weldone WF , hope that rainfall will run soon better as thats still much too high.
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Last days UV seems much too high up to 3.5 UV on some days as maximum , possible max should be 1.8UV with clear skies also solar radiation seems too high sometimes 800W/sqm global radition is max 590 W/sqm this time of the year . Rain is still a disaster up to 3 times more as my other station and my region. I know this is about UV but thought I mentioned it,
with some little clouds, the uv-index often gets higher than the clear-sky max (a known phenomena), but double the clear sky value might be just a bit too much. Mine is too high as well. (measured 2.5 when clear sky max should be 2.1)
Any source about this ? I thought raindrops could work as lenses 
I just found: “Recent studies have demonstrated that cloud enhancement of UV rays can be as high as 25%” or in a different article https://zidbits.com/2011/04/on-cloudy-days-are-uv-rays-stronger/
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but there might indeed be a raindrop on your sensor that amplifies it
Mine seems pretty ok! Had some spikes up to 2.7, but I think it is cloud reflection or raindrops indeed.
Rain is a little bit higher than my WS 2000 and other stations.
Solar radiation is ok. When I look at surrounding Davis stations, they all give between 500 and 800 W/m2.
Could solar radiation also be higher trough reflection?
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