According to TWN [The Weather Network, also referred to as Trono Weather Network by friends in the west], the temperature will immediately rise by two degrees tomorrow night at midnight here in London, ON:
The forecast high for tomorrow is 4C, and the forecast low for Wednesday is 6C. These numbers imply a sudden two-degree increase in temperature during the hour at midnight Tuesday. I suppose that's possible, but I wonder whether their weather models may need to be adjusted to allow for consistency and trends.