How to Read Snow Conditions

Fresh snowfall: the headline number

Fresh snowfall is the number everyone scrolls to first, and it is the one that gets quoted in the bar the night before. But the single figure hides a lot. What matters is not just how much fell, but over what period. Overnight snowfall, the 24-hour total and the 48-hour total are three different things, and a report that shows 40cm over two days is a very different day from 40cm that fell in the last few hours.

For most skiers, roughly 15-30cm overnight is the sweet spot. That is enough for genuinely soft, floaty turns without the visibility vanishing or the avalanche risk spiking, and it usually means the lifts and terrain can open on time. Once you get well beyond that, days can actually get harder: flat light in heavy cloud, deep trail breaking, and terrain kept shut while patrol does avalanche control.

One honest word of warning. Resorts are in the business of selling lift passes, and reported snowfall totals can be measured generously, often at the highest, snowiest weather station on the hill. Treat a suspiciously round, headline-grabbing number with a little scepticism, and always check the timestamp. Twenty centimetres that fell overnight and is still falling beats fifty that came down three days ago and has been skied to ice since.

Snow type and surface conditions

The words on a snow report are a language, and once you can read them you know what kind of day to expect before you clip in. Here are the ones that come up again and again, and what they actually mean when your edges hit the snow.

The most important thing to take away is that packed powder, the everyday report most days of a normal season, is genuinely great for the vast majority of skiers, even though loose fresh powder gets all the glory and the film edits. Do not write off a day just because the report does not say the magic word.

Base depth: what it means and when to care

Base depth is how much settled snow is sitting on the mountain in total, and it is one of the most misread numbers on the report. It is a cumulative figure built up over the season, and crucially it tells you almost nothing about the quality of today's surface. A metre and a half of base under a sheet of rock-hard ice is still a poor day to ski, even though the number looks reassuring.

Where base depth genuinely matters is at the edges of the season. Early on, it tells you whether there is enough cover to open terrain without rocks, stumps and grass poking through, and whether the runs you want are actually skiable. Late in the season it tells you how much is left before the lower slopes turn to grass and the resort starts shutting runs from the bottom up.

In the depths of midwinter, once there is plenty of cover, base depth matters far less day to day. At that point the fresh snowfall, the surface type and the wind tell you far more about whether it is worth getting up early. Read base depth as a coverage number, not a quality number, and you will stop being fooled by a deep base on a bad day.

Wind: the silent day-ruiner

Wind is the factor that quietly wrecks more days than fresh snow saves, and beginners almost never think to check it. It does its damage in two ways. First, it closes lifts. Gusts over roughly 30mph put exposed chairs and gondolas on wind-hold, and can shut the top of the mountain entirely, funnelling everyone onto the lower runs. A huge snowfall is little use if the lift to the good terrain is not turning.

Second, wind moves snow around after it has fallen. It scours snow off exposed slopes and ridgelines, leaving them wind-packed, firm or bare, and dumps it in sheltered pockets on the other side. This is the windward and leeward effect, and it is why you can find boot-deep loaded snow a few metres from scraped ice on the very same slope. That same wind loading is one of the biggest drivers of avalanche risk, so a windy day after a big dump deserves real caution off-piste.

The practical read: a forecast showing a great overnight total but strong ridge-top wind is a warning, not a green light. Expect lift holds, expect scoured exposed runs, and expect the best snow to be tucked in sheltered, lower-angle terrain and in the trees rather than up high where the wind has been at it.

Visibility and cloud base

Snow quality is only half the story; being able to see where you are going is the other half. When cloud sits down on the mountain, the light goes flat and even a well-known run becomes unnerving. In a proper whiteout the snow and the sky merge into one featureless white wall, and you genuinely cannot tell a flat traverse from a steep roll or an incoming lip until you are on it.

Flat light is the everyday version of the same problem: without shadows you cannot read the bumps, dips and gradient of the slope, so your legs get hammered by terrain you never saw coming. The answer on low-visibility days is almost always to drop to tree-line. Trees throw shadow and give your eyes contrast and reference points, so you can actually read the snow in front of you when the open bowls above are a blank sheet.

And the flip side is worth saying plainly, because it catches people out: a clear, blue-sky day with no fresh snow can still be an excellent day. Groomed packed powder under sunshine and good visibility is a lot of fun, and a lot of people write it off waiting for a dump that is not coming. Blue sky is not the same thing as good snow, and neither is a snowfall you cannot see through.

Temperature: the Goldilocks zone

Temperature quietly shapes the whole day, and there is a Goldilocks zone. Too cold, roughly -20°C and below, and the snow turns hard, squeaky and unforgiving, your edges struggle to bite, and the wind chill on a chairlift becomes a genuine frostbite risk that will drive you inside long before your legs are tired.

Too warm, anything above 0°C, and the snow starts to melt. It goes heavy and claggy, then turns to slush by the middle of the day, especially on sunny, lower slopes. Spring skiing lives with this deliberately, timing runs for the mid-morning window when an overnight freeze has softened just enough, but a warm midwinter day can leave the afternoon a sticky, slow mess.

The ideal sits around -5 to -10°C. Cold enough to preserve the snow quality and keep fresh snow light and dry, warm enough that you can actually enjoy being out all day without your face freezing. When you see that range on the forecast alongside a bit of fresh snow and light wind, you are looking at a good one.

Grooming reports: what groomed really means

Overnight, while the resort sleeps, piste bashers work their way up and down the runs, tilling and combing the surface and pressing it flat. A groomed run in the morning is that smooth, even, corduroy surface: predictable, fast and confidence-inspiring, and the reason first tracks on a fresh groom is one of the quiet pleasures of a season.

The grooming report tells you which runs got that treatment overnight. Groomed terrain is the safe, reliable choice: great for building confidence, for cruising, for teaching, and for the first hour while everything else warms up or gets tracked out. Ungroomed terrain, by contrast, holds onto fresh snow for longer, which is exactly what you want on a powder day, but it bumps up into moguls quickly once plenty of people have skied it.

So use the grooming report to plan your morning. Fresh corduroy early, then chase the untouched snow between the groomed runs as the day opens up, and expect the ungroomed pitches to turn to moguls by lunchtime on a busy day. Knowing which runs were groomed is knowing where the predictable fast laps are, and where the soft leftovers are hiding.

Avalanche risk: know your limits

This section is deliberately short and deliberately cautious, because avalanche safety is a serious subject that no guide article can teach you. On-piste, within the marked and patrolled boundaries of a resort, avalanche control is handled for you. The moment you step off-piste or into the backcountry, that safety net is gone and the responsibility is entirely yours.

Most alpine regions publish a daily avalanche bulletin rated on the 5-point European Avalanche Danger Scale, from 1 (low) to 5 (very high). Read it as a starting point, not a permission slip: even level 2 (moderate) days produce fatal slides on the wrong slope. Fresh snow, wind loading and rapid warming all push the risk up, which ties straight back to the wind and temperature sections above.

If you want to ride off-piste, get proper avalanche training, carry a transceiver, shovel and probe, know how to use them, go with people who do, and ideally hire a qualified mountain guide. Read the local bulletin every single day. PeakWave scores snow quality, not avalanche safety, and nothing here or on our off-piste conditions pages replaces training, equipment and your own judgement in avalanche terrain.