Newt and Jacob follow the trail of destruction left behind by the Erumpent into the Central Park Zoo, where they manage to distract it from trying to mate with a very frightened hippo. The Erumpent turns its attention toward Newt, who performs a very interesting mating dance, but then discovers Jacob, who is holding a vial of Erumpent musk. The resulting chase across Central Park ends on a frozen pond with the Erumpent sliding around and falling into Newt’s open case.
The weather on December 6, 1926 does fit the description in the script for the film:
Weather Station at: New York-Central Park Area, NY
Highest Temperature: 22 °F Rain/Precip: 0.00"
Average Temperature: 17.5 °F Snowfall: 0.0"
Lowest Temperature: 13 °F Snow on Ground: 7"