TFA Dostmann 35.1084.IT Manuel D'utilisation page 53

For every sudden or significant change in the air pressure, the weather icons will update
accordingly to represent the change in weather. If the icons do not change, then it means either
the air pressure has not changed or the change has been too slow for the weather station to
register. However, if the icon displayed is a sun or raining cloud, there will be no change of icon if
the weather gets any better (with sunny icon) or worse (with rainy icon) since the icons are already
at their extremes.
The icons displayed forecasts the weather in terms of getting better or worse and not necessarily
sunny or rainy as each icon indicates. For example, if the current weather is cloudy and the rainy
icon is displayed, it does not mean that the product is faulty because it is not raining. It simply
means that the air pressure has dropped and the weather is expected to get worse but not
necessarily rainy.
Note:
After setting up, readings for weather forecasts should be disregarded for the next 12-24 hours.
This will allow sufficient time for the weather station to collect air pressure data at a constant
altitude and therefore result in a more accurate forecast.
Common to weather forecasting, absolute accuracy cannot be guaranteed. The weather
forecasting feature is estimated to have an accuracy level of about 75% due to the varying areas
the weather station has been designed for use in. In areas that experience sudden changes in
weather (for example from sunny to rain), the Weather station will be more accurate compared to
use in areas where the weather is stagnant most of the time (for example mostly sunny).
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