The only way it can transmit is by people coming into contact with people isn't it?.
It spreads more easily in winter because people due to weather, tend to spend more time indoors and therefore nearer other people.
We are at a stage now that the economy has to take a back stage seat, so yes, we can and should lockdown even harder than we currently are. Too many non essential services still being allowed to trade is nonsense considering the state we are in, close those businesses for now will help