By Alexandra Skores, CNN(CNN) — Twenty-two aircraft flying to Denver, Colorado on Monday night had to divert to Colorado Springs due to “severe weather,” the Colorado Springs Airport told CNN. Flying near Denver can often be bumpy due to the proximity to the Rocky Mountains. On Monday night, a cold front was moving through the Denver area, bringing gusty winds near the surface and some shifts in wind direction, CNN Meteorologist Mary Gilbert reported. Colorado Springs Fire Department personnel provided medical assistance to five passengers, all from different planes, during the diversions, the airport confirmed. United Airlines, which operates a large hub in Denver, said 12 of its mainline jets were among the planes that diverted to Colorado Springs.