On February 9, 1934, the temperature in Buffalo, NY was - 29∘C. On the same day in Anchorage, AL, it was 19∘F. Which city was colder on that day?

It was colder in Buffalo, NY.

Explanation:

This is the formula for converting 19 Farenheit to Celcius:

(19 °Farenheit - 32) * 5/9 = - 7.222 Celcius

On February 9, 1934 the temperature in Anchorage, AL, was - 7.22 Celcius, while in Buffalo, NY the temperature was - 29 Celcius.