Dew point is a calculated number. It should not
be hard for the app to do this. Temperature and
humidity are what is needed as inputs.
At 12:25 PM 6/28/2013, you wrote:
Hi again, Paul,
As usual, Netatmo sent me a prompt reply, here
is what they wrote (I sent another reply and
asked if they are planning to specifically list
the actual dew point measurement and will post when I receive the answer):
Hi Sieghard,
Thank you very much for your support.
Dew point is indeed used for our calculation of
felt like temperature when done using Humidex index (see below)
We use measurements from the station
(temperature, humidity) to calculate felt like
temperature. The only data coming from other
sources is wind speed, which is currently taken
from a premium weather internet service
(Meteogroup), but will also be measured from the
weather station when we release our anemometer module.
For further details, you can refer to our help
section. I hereby include a selection:
“Feels like” temperature
This is computed data, obtained by adding the
combined effect of moisture and wind over human perception of heat and cold.
To achieve reliable data, the station uses a
combination of two usual formulae: wind-chill
which represents the effect of wind on cold
temperatures and Humidex/Heat Index which
represents the effect of moisture on high temperatures.
Humidex vs. Heat index setting
The formula used to represent the effect of
moisture on high "feels like" temperature is
either Humidex or Heat index, depending on your
geographical region. Default settings use Heat
index in the United States, and Humidex in
Canada and Europe. You can manually change the
formula used in the
<http://my.netatmo.com/settings#my_units>the unit-setting menu.
Regards,
Carlos
From: viphone@googlegroups.com
[mailto:viphone@googlegroups.com] On Behalf Of Sieghard Weitzel
Sent: Friday, June 28, 2013 7:45 AM
To: viphone@googlegroups.com
Subject: RE: More good news about the Netatmo Weather Station
Hi Paul,
Dew point indicates the point at which the
relative humidity that is in the air turns from
vapour into water hence forms dew. If the dew
point is 10 degrees Celsius and the forecast
calls for a high temperature that day of 25
degrees Celsius and a low temperature of 12
degrees Celsius then this simply means that it
will not get cold enough at night for dew to form.
Dew point is used in the calculation of the Heat
Index or, as we call it in Canada, the
“Humidex”. However, in the calculation of the
indix which in turn results in coming up with
the “Felt Like Temperature”, a set dew point of
14 degrees Celsius or 57 degrees Fahrenheit is
used in the States and 7 Celsius or 45
Fahrenheit in Canada. Either way, the Netatmo
weather station does display “Felt-Like”
temperature and while it might be nice to know
the dew point, in itself the dew point is not a
true indicator since it has to be combined with
other factors such as relative humidity to come
up with Felt Like temperature. Here is a link to
a Wikipedia article which explains it better than I can:
<http://en.wikipedia.org/wiki/Heat_index>http://en.wikipedia.org/wiki/Heat_index
I will ask Netatmo whether they have plans to
provide dew point, but I am not sure how
difficult this is ad what sort of sensor is
needed. One always has to keep in mind that even
though the Netatmo Weather Station costs $180
and one can buy simple digital wireless stations
with LCD readouts for half that or less, the
quality of the measurements are as good as what
you pay. Highly precise commercial weather
stations costs thousands of Dollars so one can’t
expect quite the same from one that is $180. But, as I said, I’ll ask.
Wind, by the way, is also a big factor in Felt
Like temperature. At this point there is no Wind
Sensor on the Netatmo Weather Station, but just
as the rain sensor is in the works, I believe a
Wind Sensor or anemometer, to use the correct term, is in the plan.
Regards,
Sieghard
From: viphone@googlegroups.com
[mailto:viphone@googlegroups.com] On Behalf Of Paul Parravano
Sent: Friday, June 28, 2013 6:38 AM
To: viphone@googlegroups.com
Subject: RE: More good news about the Netatmo Weather Station
Thank you Sieghard for this thorough report. It
appears from your description that the dew point
is not provided. Is this true? I find that in
hot weather, this measure is the most reliable
in determining real unpleasantness. If this
measure is not given, might you suggest how we
could convince the developer to include it?
Thanks again,
Paul
From: viphone@googlegroups.com
[mailto:viphone@googlegroups.com] On Behalf Of Sieghard Weitzel
Sent: Friday, June 28, 2013 09:29
To: viphone@googlegroups.com
Subject: More good news about the Netatmo Weather Station
Hello,
I just wanted to give a quick update about the
Netatmo Weather Station for those who bought it
and for those who might be interested in it.
First of all, for new members and those who
haven’t heard about it, the Netatmo Weather
Station consists of 2 modules, an indoor and an
outdoor module. The indoor module has a micro
USB connection and uses a wall adapter for power
and it also has 4 Triple A batteries for backup
power. It is a round tube about 6 inches long
and maybe 2 inches thick, there is no display at
all and it only has one touch sensitive button
at the top which one can push to force an update
or you can push and hold it to initiate pairing
mode. The indoor module connects to your WiFi
and via your WiFi to the internet so that you
can access it from anywhere in the world where
you have a data connection. It also has
Bluetooth which until recently was not used, but
now the station uses Bluetooth for the initial
setup/connection to your WiFi. This process was
inaccessible so far, but I am happy to report
that it is now fully accessible via the free
Netatmo app which you also use once the station
is paired to check the weather data provided by the station.
The outdoor module uses 900 Mhz and is
pre-paired with the indoor module and it also
uses 4 Triple A batteries. Once you put
batteries in it, it will automatically pair
itself with the indoor module and nothing else
has to be done. It is also a tube of the exact
same thickness, but it’s only maybe 4 inches
long. Both modules are made from aluminum and
have that same quality feel as an Apple product
such as the Apple Wireless Keyboard.
The weather station provides the following
information (you can of course set if you want metric or imperial units):
Indoor Measurements:
Current Temperature
Minimum and maximum temperatures in the last 24-hour period
Humidity
CO2 level in parts per million
Air quality indicator – indicates if air is good
or if CO2 is high and room needs to be aired
Noise level in decibels
Air Pressure – this is displayed with the indoor
measurements, but air pressure is the same indoors and outdoors.
Outdoor Measurements
Current Temperature
Minimum and maximum temperatures in the last 24-hour period
Felt Like Temperature
Humidity
Air quality indicator – uses government data from the nearest weather station
The app can also send push notifications about a
bunch of events such as high CO2 level, low temperature, high temperature etc.
Another new feature is that you can now buy
additional indoor units for $79, the initial
cost for the Weather Station is $180). They are
similar in size to the outdoor module and you
can place them in different rooms, e.g. you
could have one upstairs and one in the basement.
Later this year a rainfall sensor will also be
available which will measure the amount of precipitation.
Netatmo was incredibly accommodating to improve
the accessibility of the app which in the
beginning was not that great. There is still a
graphical mode which automatically activates if
you turn the phone to landscape orientation and
that of course won’t read, but in portrait mode
Voiceover reads all the information beautifully
in a simple interface. The head developer made
it possible for me to discuss the various
versions I beta tested with him directly on
Skype and it was a fantastic experience. I know
that the price for this Weather Station is on
the high side and it’s not a product for
everybody, but if you are willing to pay this
amount you will definitely get the most
accessible weather observation product out there.
Lastly, here are the links to the Netatmo
website where you can buy the station (I believe
you can also get it on Amazon) and to the
Netatmo app on iTunes, it won’t do you much good
without a weather station, but I thought I
include it anyways in case somebody wants to read the entire app description:
Netatmo Website: <http://www.Netatmo.com>http://www.Netatmo.com
Netatmo App in the App Store:
<https://itunes.apple.com/us/app/netatmo/id532538499?mt=8>https://itunes.apple.com/us/app/netatmo/id532538499?mt=8
Best regards,
Sieghard
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