Actually there are fireflies in many parts of Utah. I was just out last night
watching them at the Tintic Mill pond south of Genola. BYU made a video last
year and KSL TV news reported on them 2 years ago. Do a Deseret News search for
fireflies to see the video.
When I was younger I lived where it didn't get dark from this time of year
for the next five or six weeks. Dusk, but not dark. It is magic. Late december,
however, takes a different approach in that part of the world.