My assessment of this movie is that the Earth's orbit was not significantly moved by the asteroid. Due partly to the lack of verification by scientists in this film ( there would be global review and action ) they overlooked the fact that our Earth's ozone layer protects us from harmful ultraviolet rays. http://en.wikipedia.org/wiki/Ozone#Ozone_layer
Let us use the rain at the end of the film as a clue. Does this indicate a potential shift in orbit is periodic by year so in the next 350-360 days can Tom's crew expect extremely high temperatures again ( and a sequel )? Perhaps the film's portrayal of a ( temporary? ) shift in weather can be attributed to a change in the Earth's axis or its own rotation getting offset. Can an educated physicist who has seen this movie better answer any of these questions?
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