Understood about elevation. We are at 730 feet above sea
level. and, actually, it reads .8 inches low, not high. So
sometimes we have 28.9 inches instead of the National Weather Service
report of 29.7, for example. So I just ignore the report.
At 11:14 AM 5/14/2016, you wrote:
Hi Ann,
To what do you compare the air pressure reading of your Netatmo in
order to say it's too high?
I just checked mine and it currently reads 1,023 millibars.
when I open the Weather Office app which gives me the current
conditions from our official Environment Canada weather station
which is located at the airport (maybe 5 Km away as the crow flies)
it gives me 102.2 KPA (kilo pascals) which would be 1,022 Millibars,
so only a 1 Millibar or 0.1 KPA discrepancy.
I have looked at this from time to time and rarely find that there
is much more than a couple of Millibars of a difference. Of course
one has to keep in mind the elevation where you are and the
elevation of the official weather station if that is what you are
comparing it to. Air Pressure changes with elevation which is how
barometric altimeters work, you calibrate them by going to a
location with a precise known altitude like an airport and set them,
then as you do activities in the mountains you can get precise
altitude readings.
If you compare to an official weather station which is slightly
higher or lower in elevation then I would exist a consistant
difference in air pressure reading from Netatmo.
As for humidity, I think that is also effected a lot by local micro
changes and also the location where you put your outdoor module. You
should not have it exposed to the elements like rain or direct
sunlight, but at the same time it should of course not be in a place
where maybe there is not much airflow.
It's now 9:09 AM and the last update on the official weather station
was at 9 AM and it shows 40% humidity and 12 degrees Celsius, my
Netatmo shows 49% humidity and 10.2 degrees.
It still gets cold at night some nights, this morning at 7 AM it was
only 1 degree at the airport, at 8 AM it was already 8 degrees, now
at 9 AM it's 12 degrees and we are supposed to get a high of 23 or
24 degrees this afternoon with not a cloud in the sky, not too bad
for northern BC in mid May, thanks El Ninio!
All in all I think that Netatmo is a good product, well made and it
seems accurate enough.
Regards,
Sieghard
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Ann Byrne
Sent: Saturday, May 14, 2016 8:43 AM
To: [email protected]
Subject: Re: Netapmo weather
On our station, the air pressure is consistently about .8 inches too high.
I don't know about the humidity.
At 10:18 AM 5/14/2016, you wrote:
>Hi,
>
>I am considering the purchase of the Netapmmo weather
>system. According to the Amazon reviews it seems many units do not
>come calibrated to accurately measure air pressure and
>humidity. Some of these are old comments so I was wondering if
>people on this list would be willing to share their
>experience. It's a mighty expensive product so I want to make sure
>it's a good, durable, reliable product before buying it.
>
>Thanks.itg.
>
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