We have not supported METEO.it and The Weather Channel yet. But we are going to support weather underground PWS https://www.wunderground.com/, which should be similar with The Weather Channel, as both owned by IBM.
Weather providers have their own data source and modeling method, so their data could be different. That's why we support multiple weather providers, such that customers can select the one works best in their area. If my guess is correct, the last picture is for Darksk. The first two have 0/0 for Lun because the other two weather providers do not support 1-week forecast data, which is fine as we fetch weather data and update your watering schedules everyday.