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This article presents an integrated thermal and dynamic model of Electric Vehicles (EV) to assess the effect of implementing a passive heating method on increasing the electric range of a typical light-duty electric vehicle in cold climates. By introducing passive thermal storage using phase change materials (PCM) temperature of the vehicle's compartment is maintained at certain set point for comfort. Thermal model uses the overall heat transfer coefficient from the compartment to the ambient in cold weather and assumes uniform temperature distribution in the compartment. We use real-world driving, parking and estimated probability of charging for more than 10 thousand daily duty cycles recorded in the city of Winnipeg, Manitoba, Canada. We simulate driving a typical light-duty electric vehicle (EV), with 24 kWh of battery storage over 44 million data points of the database in low temperatures ranging from 0°C to -20°C.