Leicester overcame Watford and the elements at a snowy King Power Stadium as Claudio Ranieri endured an unhappy return.
James Maddison broke the deadlock for the hosts after a shocking mistake from William Troost-Ekong at the back.
But Josh King equalised from the penalty spot to continue his rich vein of form for the Hornets. The Jamie Vardy slotted a brace before the break to put the hosts in full control. A heavy onslaught of snow caused havoc for the players with conditions worsening and both teams struggling to keep their footing.