Much of the UK could be covered in a "nice and pretty" light dusting of snow in the middle of next week as it is set to get "noticeably colder".
Forecasters at MeteoGroup do not expect the snow to cause any disruption and believe temperatures will climb again by next weekend.
People everywhere will notice a significant cold snap as Tuesday brings highs of between just 4C and 6C, dropping below zero in many areas on Tuesday night.
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The man, in his thirties, was found with stab injuries on the upper deck of a bus in Handsworth, Birmingham, on Monday night.
Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.
Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.