Warmest Winter in a Decade

ABC's Clayton Sandell on what this wild weather means for spring.
2:13 | 03/07/12

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Transcript for Warmest Winter in a Decade
The US government made it official today announcing that this is the single warmest winter in a decade in America and here's what it looks like two thirds of the country. Those states in red and yellow have been abnormally warm so warm millions of people should Begin bracing for the consequences around the corner. For one thing experts say they are starting to see mosquitoes. Swarming way before spring arrives. And tracking it -- for us tonight ABC's Clayton send out. High temperature records broken by the hundreds. Moist air helping kick start an unusually early on blue deadly tornado season. -- was not only warmer it was dry the third smallest amount of snowfall in nearly a half century. That's will be felt in the west more drought that threatens water supplies drier forests that fuel devastating wildfires. At the new York botanical gardens flowers are blooming a month early. These wants to just everywhere in this holes in the south insects are -- falling earlier than normal many insects are fooled into thinking that -- -- spring. And they can to help. Today in Pass Christian in Mississippi they're already spraying for mosquitoes. There was no winter frost to kill their -- That lack of winter frost is also sending pollen -- skyrocketing. Making for an early start to what will be a long. And nasty allergy season and warmer winters are gonna bring out the pollen and their government people sicker. But one fits the pattern that scientists have been telling us. Back as people pump more greenhouse gases into the atmosphere. The planet is getting warmer and it will continue to warm on average as we go into the future. For more extreme weather or snow didn't type storms and torrential downpours -- flood entire -- -- and scientists believe the possibility of more frequent and stronger tornadoes and hurricanes. Forecasters tell -- spring will also be unseasonably warm and even though it's snowing here in Denver today just yesterday it was seventy degrees. More evidence of the wild swings in weather that we can expect in the future Diane. Wild swings in weather thank you Clayton.

This transcript has been automatically generated and may not be 100% accurate.

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