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Mount Dione
Mts. Dione and Tantalus.jpg
Mount Dione (left) with Mt. Tantalus
Highest point
Elevation 2,589 m (8,494 ft)
Prominence 129 m (423 ft)
Parent peak Mount Tantalus (2608 m)
Listing Mountains of British Columbia
Geography
Location Tantalus Provincial Park
British Columbia, Canada
Parent range Tantalus Range
Pacific Coast Ranges
Topo map NTS 92G/14
Climbing
First ascent 1916 by J. Fyles and T. Fyles
Easiest route Scrambling Southeast Ridge

Mount Dione is a 2,589-metre (8,494-foot) summit located in the Tantalus Range, in Tantalus Provincial Park, in southwestern British Columbia, Canada. It is situated 17 km (11 mi) northwest of Squamish, and 0.24 km (0 mi) north of Mount Tantalus, which is its nearest higher peak and the highest peak in the Tantalus Range. The Dione Glacier lies on the southern slope, and the Rumbling Glacier lies to the northeast. Precipitation runoff from the peak drains east into tributaries of the Squamish River, or west into tributaries of the Clowhom River. The first ascent of the mountain was made in 1916 by Tom Fyles and his brother, John Fyles, via the southeast ridge. The mountain names in the Tantalus Range have a Greek mythology theme, and Mount Dione was named for Dione, the wife of Tantalus. The mountain's name was submitted by Neal Carter of the British Columbia Mountaineering Club, and was officially adopted on June 6, 1957, by the Geographical Names Board of Canada.

Climate

Based on the Köppen climate classification, Mount Dione is located in the marine west coast climate zone of western North America. Most weather fronts originate in the Pacific Ocean, and travel east toward the Coast Mountains where they are forced upward by the range (Orographic lift), causing them to drop their moisture in the form of rain or snowfall. As a result, the Coast Mountains experience high precipitation, especially during the winter months in the form of snowfall. Temperatures can drop below −20 °C with wind chill factors below −30 °C. The months July through September offer the most favorable weather for climbing Dione.

Alpha, Dione, Tantalus
Alpha Mountain (left), Dione and Tantalus to right, as seen from the Sea to Sky Highway

Climbing Routes

Established rock climbing routes on Mount Dione:

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