How cold was it when Niagara Falls froze in 1932?

Despite unusually cold temperatures during some winters, including that of 1932, Niagara Falls has never actually frozen. Ice forms over the river and icicles form over the falls that create the illusion that the falls are frozen, but the flow of water has stopped only once in 1848. This, however, was due to an ice jam and not because the falls were frozen.

The illusion of the falls being frozen used to be such a common tourist attraction that people were allowed to walk out onto the frozen river until the ice broke beneath tourists in 1912 and three people died.