The NWS Climate Prediction Center released their latest outlooks for December, winter, spring, and summer. La Niña conditions are present and slightly favored to persist (~55% chance) through winter 2016-17. It is one of many players in our winter weather. Click to enlarge.
Illinois has equal chances (EC) of above, below, and near-normal precipitation and temperatures.
Illinois has an increased chance of wetter than normal conditions in the eastern two-thirds of the state. Above normal precipitation in winter typically translates into more snow.
Illinois has an increased chance of being warmer than normal in spring.
Illinois has an increased chance of being warmer than normal in summer.