For six months, a resident of Madrid compared data from his iPhone with a 28-euro home weather station. The result was clear: the mobile app showed temperatures up to 5 degrees lower than reality. This is not a minor technical glitch; it affects how you dress, whether you grab an umbrella, or if you plan an outdoor route. Relying solely on your phone can leave you out of step.
Satellite data vs. local measurement: the mobile's technical error 🌡️
The iPhone app uses weather models based on satellites and distant stations, generating unreliable averages for a specific street. The home station, on the other hand, measures temperature, humidity, and pressure on your own balcony. The 5-degree difference is not unusual: the mobile estimates for a wide area, while the cheap sensor captures your neighborhood's microclimate. For the user, this means a 28-euro device offers more accuracy than a 1,000-euro phone.
Your iPhone thinks you live at the North Pole 🥶
If your mobile tells you it's 12 degrees in Madrid and it's actually 17 outside, it's not that you have a fever: it's that your app lives in a parallel reality. Dressing in a jacket and scarf when the sun is warm makes you the only one sweating on the subway. The 28-euro station, at least, warns you that winter hasn't arrived yet. Or maybe the iPhone just wants you to buy a new coat.