Climate
Rainbow over Flat Creek looking North
© Peter Volf Photography
Spring (late April - June):
Mild days and cold nights intersperse with rain and occasional snow. Valley lakes usually thaw by late May. Depending on the snow pack, snow level remains just above valley elevation until mid-June. Valley wildflowers begin blooming as the snow melts, peaking in June and July.
Summer (July and August):
Warm days and cool nights prevail, with afternoon thundershowers common. Snow level gradually retreats, with divides between mountain canyons free of snow by August. As valley flowers fade, canyon and alpine wildflowers peak.
Fall (September - November):
Sunny days and cold nights alternate with rain and occasional snow. Aspen and cottonwoods turn gold in late September and early October. As snow becomes persistant by late fall, elk move to wintering areas at lower elevations.
Winter (Late November - early April):
Snow accumulations of ten feet on the mountains and two to five feet in the valley are common. The average annual snowfall in the valley of Jackson Hole is 150", with 459" averaged over the last 10 years at the Jackson Hole Mountain Resort. The mean annual precipitation is 17.42 inches, and the average relative humidity is 50 percent. Because of the area's low humidity, the snow is usually light and dry. The dry air feels warmer and often temperature inversions exist, when it may be 15-20 degrees warmer halfway up the mountain than on the valley floor.
AVERAGE TEMPERATURES
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Day High | 28 | 33 | 38 | 48 | 59 | 68 | 79 | 78 | 69 | 54 | 39 | 26 |
| Night Low | 2 | 7 | 13 | 22 | 31 | 37 | 41 | 37 | 32 | 22 | 14 | 6 |
44F
