"Get ready for an wonderful parade, but put on every layer you have in your household, wear every glove you can find, every scarf, hand warmers, whatever you got, you're going to need it tomorrow", de Blasio said.
"It's one of the coldest", he said, but "we've watched in the rain before".
Since 1924, the Macy's Parade has enthralled the nation and become synonymous with the start of the holiday season.
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Facebook's main site also appears to be affected by the outage, though not as severely as the standalone chat app. It's called Your Time on Facebook and it's now only available through the mobile app.
Diana Ross, John Legend, Martina McBride and the Muppets from "Sesame Street" were slated to perform in the frigid cold.
The 2018 Macy's Thanksgiving Day Parade balloons are at risk of being grounded due to dangerously high winds.
Crowds gather to see giant character balloons being inflated the night before their appearance in the 92nd Macy's Thanksgiving Day parade, Wednesday Nov. 21, 2018, in NY.
According to the musical's producers, this is the first LGBTQ kiss in the parade's history.
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After the ceremony, the turkeys will go to their new home, Virginia Tech's "Gobblers Rest" exhibit in Blacksburg, Virginia. Kicking off the 71st turkey pardoning, President Donald Trump presented the two pardoned turkeys, "Peas" and "Carrots".
In another moment that got attention, a performance from the Broadway musical "The Prom" included a kiss between two female cast members.
Windy conditions are also expected and officials will be monitoring wind to see if giant character balloons, such as SpongeBob and Charlie Brown, can fly safely.
"I'm thankful I get to perform on the coldest freaking Thanksgiving ever... live!". The massive balloon was almost pushed into the sidewalk where hundreds of fans were lined up to watch the parade.
There's also a chance NY could see a record low temperature on Thanksgiving Day: Accuweather is predicting a morning low temperature of 21 degrees and an afternoon high of 27. CBS News reported that the Thanksgiving Day parade balloons were last grounded in 1971.
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An American missionary has been killed while trying to reach a remote tribe living on an island belonging to India . North Sentinel is in the Andaman Islands, a group of islands at the juncture of the Bay of Bengal and Andaman Sea.
The parade starts at 9 a.m. EST, with step-off at Central Park West and West 77th Street and making it's way to midtown, ending at 34th Street and 6th Avenue (here's the parade route).