wttr.in: Wrong weather data for Lyon (France)

Hello,

Weather forecast for Thursday 27 of April sounds really off for the city of Lyon, France.

➜  ~ curl http://wttr.in/Lyon
Weather report: Lyon, France

  _`/"".-.     Rain, Rain Shower
   ,\_(   ).   10-11 °C
    /(___(__)  ↖ 9 km/h
      ‘ ‘ ‘ ‘  6 km
     ‘ ‘ ‘ ‘   0.7 mm
                                                       ┌─────────────┐
┌──────────────────────────────┬───────────────────────┤  Tue 25 Apr ├───────────────────────┬──────────────────────────────┐
│            Morning           │             Noon      └──────┬──────┘     Evening           │             Night            │
├──────────────────────────────┼──────────────────────────────┼──────────────────────────────┼──────────────────────────────┤
│  _`/"".-.     Light rain sho…│  _`/"".-.     Light rain sho…│      .-.      Patchy light r…│      .-.      Light rain     │
│   ,\_(   ).   13-14 °C       │   ,\_(   ).   14-15 °C       │     (   ).    14 °C          │     (   ).    11-12 °C       │
│    /(___(__)  ↑ 18-22 km/h   │    /(___(__)  ↑ 15 km/h      │    (___(__)   ↘ 15-21 km/h   │    (___(__)   ↘ 18-26 km/h   │
│      ‘ ‘ ‘ ‘  19 km          │      ‘ ‘ ‘ ‘  17 km          │     ‘ ‘ ‘ ‘   13 km          │     ‘ ‘ ‘ ‘   11 km          │
│     ‘ ‘ ‘ ‘   0.8 mm | 61%   │     ‘ ‘ ‘ ‘   0.8 mm | 89%   │    ‘ ‘ ‘ ‘    3.0 mm | 100%  │    ‘ ‘ ‘ ‘    2.0 mm | 100%  │
└──────────────────────────────┴──────────────────────────────┴──────────────────────────────┴──────────────────────────────┘
                                                       ┌─────────────┐
┌──────────────────────────────┬───────────────────────┤  Wed 26 Apr ├───────────────────────┬──────────────────────────────┐
│            Morning           │             Noon      └──────┬──────┘     Evening           │             Night            │
├──────────────────────────────┼──────────────────────────────┼──────────────────────────────┼──────────────────────────────┤
│  _`/"".-.     Patchy rain po…│    \  /       Partly cloudy  │  _`/"".-.     Light rain sho…│  _`/"".-.     Patchy rain po…│
│   ,\_(   ).   4-6 °C         │  _ /"".-.     7 °C           │   ,\_(   ).   11 °C          │   ,\_(   ).   8 °C           │
│    /(___(__)  ↘ 10-21 km/h   │    \_(   ).   ↓ 16-23 km/h   │    /(___(__)  ↘ 16-23 km/h   │    /(___(__)  ↘ 12-21 km/h   │
│      ‘ ‘ ‘ ‘  16 km          │    /(___(__)  16 km          │      ‘ ‘ ‘ ‘  15 km          │      ‘ ‘ ‘ ‘  14 km          │
│     ‘ ‘ ‘ ‘   0.0 mm | 21%   │               0.1 mm | 68%   │     ‘ ‘ ‘ ‘   0.2 mm | 83%   │     ‘ ‘ ‘ ‘   0.1 mm | 47%   │
└──────────────────────────────┴──────────────────────────────┴──────────────────────────────┴──────────────────────────────┘
                                                       ┌─────────────┐
┌──────────────────────────────┬───────────────────────┤  Thu 27 Apr ├───────────────────────┬──────────────────────────────┐
│            Morning           │             Noon      └──────┬──────┘     Evening           │             Night            │
├──────────────────────────────┼──────────────────────────────┼──────────────────────────────┼──────────────────────────────┤
│  _`/"".-.     Light sleet sh…│      .-.      Heavy snow     │  _`/"".-.     Light rain sho…│  _`/"".-.     Patchy rain po…│
│   ,\_(   ).   4-6 °C         │     (   ).    10 °C          │   ,\_(   ).   11-12 °C       │   ,\_(   ).   7-8 °C         │
│    /(___(__)  ↘ 20 km/h      │    (___(__)   ↘ 22-24 km/h   │    /(___(__)  ↘ 21-26 km/h   │    /(___(__)  ↘ 14-24 km/h   │
│      ‘ * ‘ *  18 km          │    * * * *    16 km          │      ‘ ‘ ‘ ‘  14 km          │      ‘ ‘ ‘ ‘  15 km          │
│     * ‘ * ‘   1.8 mm | 32%   │   * * * *     1.2 mm | 81%   │     ‘ ‘ ‘ ‘   0.6 mm | 89%   │     ‘ ‘ ‘ ‘   0.2 mm | 83%   │
└──────────────────────────────┴──────────────────────────────┴──────────────────────────────┴──────────────────────────────┘

You can see snow prediction for this particular day while it’s spring there and weather is getting mild, with temperature records usually above 10 - 15°C at noon.

Local and other popular weather forecast services show no such thing. For instance, the french weather forecast agency shows this : http://www.meteofrance.com/previsions-meteo-france/lyon/69000 (click on ‘jeudi 27’).

About this issue

Original URL
State: open
Created 7 years ago
Comments: 16 (8 by maintainers)

Commits related to this issue

Add brightsky to the datasources list (#109) — committed to chubin/wttr.in by chubin 3 years ago

Most upvoted comments

@the-n3i Das ist echt interessant. Ich werde mir das mal genauer ansehen. Vielen Dank für den Hinweis. Ich wusste gar nicht, dass die DWD Daten frei zu Verfügung gestellt werden.

(I better switch back to English because of other users who could read this issue later). Thank you very much for the link. I’ll check the format of the data, and how often they are actualized and other things like that.

chubin on May 8, 2017

so how about accessing different countries’ official weather services? At least the German weather service offers free FTP access and I’m sure others do that as well. Using a local weather service should give more accurate predictions, right?

the-n3i on May 8, 2017

Yes, but you are right. Our datasource is sometimes really inaccurate. I think the best solution would be to have several datasources and let users choose from

chubin on Apr 25, 2017

@vestingz BrightSky looks pretty decent. Thank you for pointing me at it. I will add it to the potential data sources list

chubin on Oct 31, 2021

@the-n3i It’s a good question. I don’t know if a local weather service gives more accurate predictions, but it is at least a good idea to have different data sources and combine them (or give a user ability to chose from). What German local weather services are you talking about?

chubin on May 8, 2017