The lake breeze is shown to develop on 30% of all summer days in the Toronto region, similar to other findings in the Great Lakes area. Simulations with the Colorado State University (CSU) model show that under northwest to north gradient flow the lake breeze is characterized by a broad band of westerlies over the lake, while southwesterly gradient flow produces a broad band of easterlies. A nocturnal mesoscale cyclonic eddy is predicted over western Lake Ontario under west and northwest gradient flow conditions. / A statistical model intercomparison of the CSU and Ontario Ministry of Environment models over a 19600 km$ sp2$ domain centred on Pickering, ON revealed the CSU model generally more accurately predicts the temporal and spatial lake breeze characteristics. This is attributed to improved model parameterizations and larger domain size enabling the model to resolve the full-lake scale circulations which develop.

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