I am currently running the 2018 version of Weather34 alongside the latest build and noticed a variance in the temperature 'Feels' field. Now I have to say this particular measurement is not important to me, in fact I am more concerned that my humidity sits at 100% a lot of the time and I will take a closer look at the sensor this coming weekend.
Given that the source data for both screens is the same, can anyone tell me how this temperature is calculated and why the difference between versions?
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Latest Cumulus MX V3 release 3.28.5 (build 3282) - 23 February 2024
Cumulus MX V4 beta test release 4.0.0 (build 4017) - 17 March 2024
Legacy Cumulus 1 release v1.9.4 (build 1099) - 28 November 2014 (a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
Temperature 'Feels' variance
Moderators: saratogaWX, weatherist34
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Temperature 'Feels' variance
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/d
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Re: Temperature 'Feels' variance
I am not a coder but decided to have a look and found a livedata.php script in the template set. In this script it has temp_feel variable which I presume is the 'feels like'. Comparing most recent vs older versions it looks like the calculation has changed between these versions.
The most recent version by SaratogaWX in livedata.php has: $weather["temp_feel"] = apparent_temperature($weather['temp'],$weather['humidity'],$weather['wind_speed']);
The first version posted by SaratogaWX dated January 4, 2019 has: $weather["temp_feel"] = heatIndex($cumulus[2], $cumulus[3]); // must set temp_units first
An August 2018 version from Brian the livedata.php has: $weather["temp_feel"] = heatIndex($cumulus[2], $cumulus[3]); // must set temp_units first
So it appears that in the most recent version Ken has modified Brian's calculation and that gives a slightly different result.
Enjoy,
Paul
EDIT:
I am also testing Wim's (Leuven Template author) Weather Underground version that uses the WU API and that shows a different result as well. The FeelsIike variable in the temperature_block is much different. Therefore, as the script authors have said, it is important to not mix between the versions.
http://www.komokaweather.com/pws-wu/index.php Wim's version for WU API
http://www.komokaweather.com/pws/index.php Ken's version for Cumulus 1 and MX
http://www.komokaweather.com/pws-wfl/in ... theme=dark Ken's version for Cumulus but using the WiFiLogger realtime.txt file (which is the same format as the Cumulus reasltime.txt file but does not have all of the data that is calculated by Cumulus).
The most recent version by SaratogaWX in livedata.php has: $weather["temp_feel"] = apparent_temperature($weather['temp'],$weather['humidity'],$weather['wind_speed']);
The first version posted by SaratogaWX dated January 4, 2019 has: $weather["temp_feel"] = heatIndex($cumulus[2], $cumulus[3]); // must set temp_units first
An August 2018 version from Brian the livedata.php has: $weather["temp_feel"] = heatIndex($cumulus[2], $cumulus[3]); // must set temp_units first
So it appears that in the most recent version Ken has modified Brian's calculation and that gives a slightly different result.
Enjoy,
Paul
EDIT:
I am also testing Wim's (Leuven Template author) Weather Underground version that uses the WU API and that shows a different result as well. The FeelsIike variable in the temperature_block is much different. Therefore, as the script authors have said, it is important to not mix between the versions.
http://www.komokaweather.com/pws-wu/index.php Wim's version for WU API
http://www.komokaweather.com/pws/index.php Ken's version for Cumulus 1 and MX
http://www.komokaweather.com/pws-wfl/in ... theme=dark Ken's version for Cumulus but using the WiFiLogger realtime.txt file (which is the same format as the Cumulus reasltime.txt file but does not have all of the data that is calculated by Cumulus).
Davis Vantage Pro2+
C1 www.komokaweather.com/komokaweather-ca
MX www.komokaweather.com/cumulusmx/index.htm /index.html /index.php
MX www.komokaweather.com/cumulusmxwll/index.htm /index.html /index.php
MX www. komokaweather.com/cumulusmx4/index.htm
C1 www.komokaweather.com/komokaweather-ca
MX www.komokaweather.com/cumulusmx/index.htm /index.html /index.php
MX www.komokaweather.com/cumulusmxwll/index.htm /index.html /index.php
MX www. komokaweather.com/cumulusmx4/index.htm
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- Posts: 95
- Joined: Mon 30 Jul 2018 10:23 am
- Weather Station: Instromet
- Operating System: Raspbian
- Location: Karby 7960
Re: Temperature 'Feels' variance
Thank you for that, it actually felt quite warm out with the dogs this afternoon, so I am inclined to agree with the latest version despite my view being quite subjective
/d
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