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Month by month

High on the west ridge, looking back to the peak of Boca de la Pesca (Route 17)

January and February have many cold, clear and sunny days but there always exists the possibility of some days with heavy snowfalls. Temperatures will be at their lowest in the mountains and so these months tend to provide extensive icing together with short daylight hours. Crampons and ice axe, and the ability to use them correctly, are essential.

March and April provide longer days and slightly warmer temperatures. History shows a week of prolonged bad weather during March or April. This late-season snowfall has the advantage of extending the snow and snowshoeing season well into May. Winter hillwalking can be excellent during these months. Crampons and ice axe are essential.

May can provide great snow-walking opportunities, although the snow pack softens markedly after midday. The snows are retreating fast up the mountain now and some routes to 3000m peaks are likely to be clear. There is still some risk of heavy rain showers, lessening towards the end of the month. Some sections of old hard snow will remain at the end of May, possibly necessitating the use of crampons for safe passage. Where such sections exist, notes are given in the route descriptions.