I love the Shamrock Shuffle! I've run it different years, and have had vastly different weather conditions. One year we ran during a blizzard, and the following year was unseasonably hot (80 degrees), so it's a gamble on the weather. That said, it's always a gamble on the weather in Chicago, so nothing too unexpected. This is a great race for an 8K. Awesome course through the city, which is a view you don't typically get with empty streets. There is always a lot of great swag at the expo, so if that interests you, then make your move. Wicked fun race to start off race season!