A refined correlation method of synoptic pattern classification defines 32 unique types which control the summer climate of Quebec-Labrador. The synoptic catalogue is dominated by Hudson Bay cyclones on 38% of early summer days and by northern cyclones on 56% of fall days. August marks the seasonal progression from summer to fall with almost complete type transience. / Each type evokes a distinct response in surface climate and energy balance components. Representative type temperature deviations allow the reconstruction of daily and monthly temperature records. Radiative characteristics are defined for each synoptic pattern, yet there is little variation in cloud response to the type catalogue. Precipitation can be expected with any type occurrence and anticyclonic domination contributes significantly to summer precipitation. / The equilibrium evaporation model is extended to sub-arctic environments by using a Priestley-Taylor constant of (alpha)(,1) = 1.27. Seasonal variations in stored lake energy require synoptic evaporation estimates to be further categorized into three periods.

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