Backdoor RH% Sanity Check?

[Old Tele man]

How many people have compared their OSI weather station RH% values against other surrounding CWOP or NWS values in an effort to learn how "close/far" their OSI values are from reality?

I ask, because it's looking as though the TEMP's are OK (±1ºF), but the RH% and DEWPOINT TEMP (Tdp) values are obviously not OK. The Tdp values around me (3 other CWOP within 5 miles) seem to be basically "flat" with minor fluctuations (not counting big WX changes), while MY Tdp values are mirroring the TEMP shape both day and night...which (to me) indicates the RH% values are wrong, because Tdp is merely a derived (calculated) function of TEMP and RH%.

Anybody else notice similar "idiosynchracies" in their OSI weather station outdoor sensor (THGN801) values, especially RH% and Tdp? If yes, what have you done to compensate for their error(s)? Any suggestions or ideas? I've already written OSI asking about "better" accuracy, but I'm not holding my breath.

Thanks...

[SlowModem]

How many people have compared their OSI weather station RH% values against other surrounding CWOP or NWS values in an effort to learn how "close/far" their OSI values are from reality?

I ask, because it's looking as though the TEMP's are OK (±1ºF), but the RH% and DEWPOINT TEMP (Tdp) values are obviously not OK. The Tdp values around me (3 other CWOP within 5 miles) seem to be basically "flat" with minor fluctuations (not counting big WX changes), while MY Tdp values are mirroring the TEMP shape both day and night...which (to me) indicates the RH% values are wrong, because Tdp is merely a derived (calculated) function of TEMP and RH%.

Anybody else notice similar "idiosynchracies" in their OSI weather station outdoor sensor (THGN801) values, especially RH% and Tdp? If yes, what have you done to compensate for their error(s)? Any suggestions or ideas? I've already written OSI asking about "better" accuracy, but I'm not holding my breath.

Thanks...

• AZ CWOP - DW6988 (inactive)

I have a LaCrosse, Davis and OS all on the same pole.  They all read pretty close (most of the time) (except that the Lacrosse only goes up to 87% RH).

[Faceng Ret]

I just recently installed a Davis VP2 and have had an OS WMR200 for over 2 years. I have the temperature/humidity sensors mounted on the same post at the same height. Both the OS and Davis sensors are mounted in a daytime FARS. The temperature readings are consistently within 1/2 a degree of each other, but the OS humidity reading is always 8 to 10 percent lower than the Davis. On the consoles which are within 2 feet of each other, the OS always shows the same 8-10 percent less for indoor humidity. On CWOP the humidity on the Davis is very close to that reported by stations within 4 miles of my station.

[SlowModem]

...which LaCrosse outdoor sensor are you using?

I have the LaCrosse WS-2316, OS WMR968 and Davis VP2.

[SlowModem]

...something I didn't mention, the outdoor THGN801 (as well as the indoor 10-channel THGR810) are the newer Protocol #3 devices, not the older Protocol #2.1 devices, which negates any "backward" compatibility.

...I searched, and see that OSI has had problems with their RH% sensor accuracies for quite awhile now...although, those would have been Protocol #2.1 sensors.

Now that I think about it, I don't use the THGR968, the RH died shortly after being put in serivce.  I use the THGR122N.