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Difference in readings between PWS, WU & weatherlink

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hdtvluvr:
Weather Station is a Davis Vantage Pro2

Temperature  WeatherLink 72, WU 71 (9 minutes ago) and PWS is 68.7 (11 minutes ago). 
Humidity  WeatherLink 84%, WU 79% (1 minute ago) and PWS is 92% (6 minutes ago).

Why such a difference?

On WU, it has Pressure, Dew Point, Humidity, Rainfall, etc under Additional Conditions.  Is this data from my station or elsewhere? Humidity seems to be staying 3 - 4 % less on WU than the WeatherLink data.

Just rechecked WeatherLink and PWS.  Weatherlink says 74 (83% Hum) and PWS is 70.6 degrees (92% Hum 6 minutes ago).  PWS has my station listed as "Initiating".  Is the Initiating the reason the data is off?  Seems that it should match.  I like the layout of PWS but if the data isn't correct then it is unusable.  It also appears to be updating 20 - 25 minutes apart instead of the 15 minutes for WU. 

PaulMy:
Hi,
I am not familiar with PWS "initializing" but if yours is a very recent signup you may need to be patient.  How are you updating PWS?  I presume updating WU through Weatherlink.com?

I am uploading to Weatherlink.com, WU and PWS from the same IP device at 5-min interval (and half a dozen other sites) and data seems to be pretty consistent between them.

Enjoy,
Paul

hdtvluvr:
PWS sets new stations to initializing for several days while they check and somehow QC the data.  I'm updating WU from Weatherlink.com.  I have the basic plan and uploads occur every 15 minutes to 3 potential sites - WU, CWOP and WOW.  For PWS, I created an account and then added my station there by entering the 2 API V2 keys.  I thought that would allow PWS to call for data when it decided to.  The 20 plus minutes it is changing seems a long time.  I have to sign up for a Pro account for 5 minute uploads but not sure that would cover PWS since it isn't one of the 3 they list.  I assume WeatherLink pushes data to the 3 sites and thought that PWS might query WL for data.  Can't find a way to change anything in PWS.

Data across the 3 sites now are very close and could be rounding errors
WeatherLink  78 deg and 63% humidity
WU 78.1 and 62%
PWS 78.5 and 62%

PaulMy:


--- Quote ---For PWS, I created an account and then added my station there by entering the 2 API V2 keys.  I thought that would allow PWS to call for data when it decided to.
--- End quote ---
I am not familiar with that upload process as I upload from my WiFiLogger to PWS, and also another PWS account uploaded by Cumulus.

I know CumulusMX can access Weatherlink.com data through the API but not aware that PWS can do that.

Enjoy,
Paul

hdtvluvr:
Well, PWS must be able to access Weatherlink.com (using the API keys) because data is getting to PWS and I can't upload the data to PWS through the Weatherlink.com website.  How often does CumulusMX pull data? 

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