TFA 35.1078.10.IT Instruction Manual page 34

WEATHER FORECAST AND WEATHER TENDENCY:
WEATHER FORECASTING ICONS:
The weather icons in the third section of LCD can be displayed in any of the
following combinations:
Sunny Cloudy with sunny intervals Rainy
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 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).
If the weather station is moved to another location significantly higher or lower
than its initial standing point (for example from the ground floor to the upper
floors of a house), discard the weather forecast for the next 12-24 hours. By
doing this, the Weather Station will not mistake the new location as being a
possible change in air-pressure when really it is due to the slight change of
altitude.
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