How well the sensor works outdoors depends on quite a number of environmental factors.
To be honest, it doesn't work very well in sunlight.
But how well is difficult to say.
Sunlight hitting the target from behind the sensor is the worst case as photons from the sun are reflecting back to the sensor.
Sunlight perpendicular to the line between the sensor and the target is best case as the sunlight tends to just pass through.
How bright the day is matters too.
940nm light from the sun will saturate the sensors photon detector and you end up with no headroom to detect the signal from the sensor.
I always recommend you test it in your expected environment. sometimes just turning the sensor 90 degrees will help, or sometimes your structure can shade the sensor somewhat.
In short-distance mode, there are more pings per millisecond, so you end up with a stronger signal. This can help a little, but there is not much that can be done in strong sunlight.
- john
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