Re: [weewx-user] Pausible values for UV sensor?!

Thank you very much Anton! I'll try all of these ideas :) Also, I just talked to a friend who works for a company that calibrates medical instruments. They don't have a calibrated 'UV emitter', but they do have a calibrated UVA and UVB receivers (for babys that just born and need UV light). So my

Re: [weewx-user] Pausible values for UV sensor?!

Ok, thank you guys! Here, in Ribeirão Preto, I'm getting almost everyday warnings on TV about extreme UV levels, so I'm pretty sure it's more than 11 almost all day. But in my opinion, 20 it's too high. I have tried both openuv.io and ogimet openuv.io shows me: "uv": 0.041, "uv_time":

Re: [weewx-user] Pausible values for UV sensor?!

For clear-sky reference values you could look at https://www.openuv.io/ That site provides info dedicated for the location you ask: info includes much more than UVI only. For automatic extraction of info a script will be needed. If you want automatic info on attenuation by clouds, then

Re: [weewx-user] Pausible values for UV sensor?!

An open source for getting UV-values calculated for your location is at https://www.openuv.io/ *Be aware* that the outputdata is for 'clear-sky': for a cloudy or rainy day the value must be recalculated by yourself ... But at least you get good reference/ceiling-values for the bright days.

Re: [weewx-user] Pausible values for UV sensor?!

https://wiki.cancer.org.au/skincancerstats/UV_radiation : The UV Index is a standardised measure used to express UV radiation intensity. It is equal to 40 times the erythemally effective power of the sun in W/m2. The UV Index at solar

Re: [weewx-user] Pausible values for UV sensor?!

1 mW/cm^2 would be 10 W/cm^2 which is 100 000 W/m^2 of UVB. Total solar radiation should be on the order of 1300 W/m^2 (it's nominally 1000 max here at 42N) at overhead sun, so 10x the power just in UVB makes zero sense. I am at 42ish North (Massachusetts, US), and with a Davis UV sensor,