And calgary is southern alberta, closer to the US border than it is to northern canada. Fort McMurray and areas north regularly get -40 weeks and still have loads of bugs come summer.
(Being so far from any coast, the northern canadian praries often trade turns with inner siberia for the coldest place on earth during winter. The north pole is kept "warm" by the sea.)
Calgary has a few weeks of -30C every winter, and we are not short on mosquitoes.