It's not the weather. They've been working through the worst of conditions, including the week that highs were in the low single digits. It was the city's delays with moving the water (iirc) lines because what they found when they dug up was older than they anticipated. That I'm guessing, even though they won't say this, and they probably delayed it so they could make their changes to the plans. The water lines was a month tops, this is a 2 month delay.