What Falling Back Does to Your Sunset, Town by Town
An hour, overnight
When daylight saving time ends on the first Sunday of November, the clock moves back an hour and so does sunset. In New York, NY, sunset goes from 5:53 pm the evening before to 4:52 pm the evening after. That single night is why the dark seems to arrive all at once, even though the days have been shortening since June.
How many places drop below 5 pm
The day after the change, sunset is before 5:00 pm in 1,114 of 3,206 places. On the solstice it is 1,860, and the evenings have already started to turn by then (see why the earliest sunset comes first). Arizona and Hawaii do not change their clocks, so their sunsets slide steadily instead of jumping, which is why 45 places show no jump at all, among them Phoenix, AZ, Tucson, AZ, Mesa, AZ.
When the hour comes back
Springing forward in March gives the hour back in one night: in New York, sunset goes from 6:00 pm to 7:01 pm. By then the days are also growing fastest, about 2.7 minutes a day there around the March equinox. Each place page lists both changes for that town. What the dark months mean for a morning alarm is in the alarm and lamp guide.