See also, more generally, our Wind topic.
The Environment Canada wind sensor is reliable for all wind directions, but note that the Kingston airport is inland somewhat, just outside the prevailing-wind "funnel" that is Kingston harbour, and is less prone to sea breezes than is Kingston Harbour, though occasionally the airport will sense the seabreeze front before the harbour does. Beware that sometimes the airport sees entirely different wind from that felt in Kingston Harbour.
The Environment Canada sensor gives little or no sense of the range of breeze shiftiness.
The iWindsurf.com website provides the basic wind velocity and direction plot for free, and subscribers get access to a variety of other weater forecasts and services.
BEWARE: This sensor is reliable only for winds from the Southern sector.
BEWARE: This sensor does not report data collected between 8 pm and 6 am.
Kingston Yacht Club Wind Sensor
The KYC online wind sensor is located atop the crane on the club breakwall which protrudes somewhat into Kingston Harbour. It's display shows the recent history of wind velocity and velocity range, and direction. Take note that this sensor is prone to gaps in responding, so be sure to check the "Last Updated" label to ensure you aren't looking at stale, or in some cases really stale, data.