(1) Safety.—The shortness of the days and the great variations of temperature, from mild and equable to bitterly cold, all add an element of danger to the High Alps in February. A small mishap may have very serious consequences. A broken leg half-way down Monte Rosa or the Wetterhorn probably means a night in the open, and a night in the open may mean a fatal ending. The sudden changes of weather, the storms that rise in a night and last for days, all make February ski-ing among the glaciers a sport with its own dangers. In May all these risks are reduced almost to vanishing-point. A broken leg is a broken leg in February or in May, but a night in the open in May should have no permanent effect on any but a very badly wounded climber.
We have already dealt with avalanches. Here we need only repeat that though avalanches are of daily occurrence in May, an experienced party has no difficulty in avoiding them. They have a regular time-table, and, provided one times one’s ascent or descent so as to avoid crossing certain slopes at certain hours, one is absolutely safe. In winter, avalanches can fall at any hour of the day, under certain circumstances, and at any temperature. To take a concrete example: the Gauli hut. This hut lies at the head of a very steep and narrow valley, the Urbachthal. In winter one would never be quite safe in this valley. A sudden wind might rise and bring down a powder avalanche; and even in steady weather the risk of a powder avalanche from the very steep sides of this valley is never entirely absent.
In spring one leaves Meiringen before midnight, climbs this valley at night, and, provided the weather is fine, one is absolutely safe; for in spring, avalanches fall in the afternoon and never fall at night, save when the Föhn is blowing. And when the Föhn is blowing the ski-runner stays at home, or remains in a club hut.
Finally, the glaciers are not oversafe in winter, for reasons explained on pp. [448-449]. In May all save very badly crevassed glaciers can be descended on ski by an unroped party, without greater risks than those which must be faced by every bold pedestrian that crosses Piccadilly Circus. The crevasses are never so securely bridged as in spring.
(2) Quality of the Ski-ing.—In winter it is the exception to find good snow in the High Alps. The wind, as has already been explained, spoils the snow on all exposed slopes. But in May the wind is powerless, for the first fine day and hot sun will melt the snow so thoroughly that all traces of wind action during the snowfall will entirely disappear. Thenceforward the wind is powerless, for the wind cannot churn up the heavy melted snow of spring, still less the hard crust which is found in the early morning.
Snow in spring is hard crust in the early morning, Telemark crust up to midday or later on high north slopes. In the afternoon it is usually soft and heavy, but in the evening it once again yields fine ski-ing.
The ski-runner who visits the High Alps in winter can form no forecast as to the possible conditions of the snow, for the snow is dependent on the direction and on the strength of the winds that have blown since the snow fell. It is therefore a matter of chance whether the snow is good or bad, for nobody can foretell the conditions which depend on such a fickle element as the wind. The longer fine weather endures in winter, the greater the chance that the snow will be spoiled. In spring the reverse is the case. The more often snow is melted and refrozen the better it becomes. In general, provided the weather remains fine, the spring ski-runner can count almost with certainty on perfect ski-ing and perfect snow.
An important point in favour of spring is the fact that one usually gets good ski-ing for every foot that one climbs on snow. In winter the summit snow slopes are often so windswept, that the ski are left some distance below the actual top and the final ascent is made on foot. In spring the snow is just as good on the most exposed summit slope as lower down. I have started spring or summer ski descents from the actual summits of such peaks as the Dom, Ebnefluh, Galmihorn, etc. This is an important advantage, and more than counterbalances the fact that the snowline is higher in May than in February; for though one may lose a thousand feet of ski-ing on the last day, one more than balances this loss by the fact that good ski-ing is obtained from the highest limit of the snow.
The snowline in May usually extends down to 5000 feet. I have spent three May months in the Alps, and I have always been able to get good ski-ing well on to the middle of May down to about 5500 feet, and sometimes lower. In narrow valleys the remains of spring avalanches survive into the summer. I have skied in the middle of June below 6000 feet in the Gredetschthal, and I have often, in the middle or end of June, obtained first-class ski-ing below 7000 feet.
Of course the height of the snowline is of no very great importance if, as is usually the case, one spends four or five days on the glaciers. One can sacrifice a thousand or two thousand feet of ski-ing on the last day with complete composure if one is certain, as one is never certain in winter, that one will get really good ski-ing for every foot of snow slope that one climbs.