Mountain Weather
Information Service

Icon Information


Wind Show More

Light wind

Light wind

Little wind or walking hardly affected by the wind. 10-15mph or less.

Moderate breeze, fairly small impact

Moderate breeze, fairly small impact

A noticeable breeze, locally may be gusty, but unlikely to affect progress. 15-25mph.

Windy, walking impeded

Windy, walking impeded

Blustery conditions, enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 35mph.

Gale force, walking arduous

Gale force, walking arduous

Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 35 to 55mph.

Severe gale or storm, mobility very difficult

Severe gale or storm, mobility very difficult

Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+


Visibility Show More

Clear

Clear

Excellent or superb visibility, no navigation issues.

Clear over snow cover

Clear over snow cover

Excellent or superb visibility, but be aware that paths may be obscured by lying snow.

Poor visibility

Poor visibility

Very murky conditions, the mountains shrouded in fog, making navigation challenging. Map and compass essential.

Whiteout

Whiteout

Fog and lying snow over the mountains, possibly with falling or blowing snow, very disorientating. Map and compass essential, beware of unseen hazards such as cornices.


Precipitation Show More

Sunny winter day

Sunny winter day

Blue skies and crisp winter sunshine.

Fine, partly cloudy winter day

Fine, partly cloudy winter day

Dry winter day with partly cloudy skies, cloud banks covering some mountain slopes.

Dry, Inversion

Dry, Inversion

Banks of cloud or fog on lower or middle slopes, but higher terrain likely clear and sunny above an inversion.

Sunshine and showers

Sunshine and showers

A mixed weather day, with rain on and off, briefly heavy, but mixed with periods of sunshine.

Drizzle

Drizzle

Light rain or drizzle, total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.

Moderate rain

Moderate rain

Steady rain fairly persistent, occasionally heavy, rather wet underfoot.

Heavy rain

Heavy rain

Near-constant heavy rain, sometimes torrential over the mountains, very wet underfoot.

Thunderstorm

Thunderstorm

Heavy or torrential downpours with hail, risk of thunder and lightning. Seek shelter where possible.

Snow flurries

Snow flurries

Occasional light snow flurries, possible soft hail. Amounts little more than nuisance value, but reducing visibility for periods.

Snow showers

Snow showers

Periods of bright or sunny conditions mixed with showers or flurries of snow, sometimes hail, falling to low elevations.

Snow

Snow

Snowfall continuous or frequent, beware of conditions becoming challenging.

Heavy snow

Heavy snow

Continuous or almost constant heavy snowfall, large flakes falling to low elevations. Beware of near-zero visibility from falling or blowing snow, risk of blizzard conditions.

Snow and rain mix

Snow and rain mix

Precipitation falling mostly as snow over higher ground, but wetter lower down with sleet or mostly rain on lowest terrain. The freezing level may vary locally and during the course of the day.

Heavy showers, snow and hail

Heavy showers, snow and hail

Showery precipitation, often heavy, may merge to become constant for periods. A mix of snow and hail on higher terrain, rain or hail lower down. Risk of a rumble of thunder and isolated lightning.


Temperature Show More

Very Cold

Very Cold

Very low air temperatures or feeling bitterly cold due to wind chill on the mountains. Difficult conditions. Frostbite and hypothermia risk. Suitable protective clothing is required.

Cold

Cold

Low temperatures over the mountains all day. Suitable protective clothing required. Beware of significant wind chill at higher levels.

Cool

Cool

Feeling chilly on the hills, especially if exposed to any wind. May not feel cold when climbing, but noticeably cold when stationary. Carry suitable clothing.

Mild

Mild

Not cold, air temperature above freezing to highest summits. May feel pleasant on lower ground, but take appropriate layers. Feeling chilly if exposed to wind.

Warm

Warm

Comfortable temperatures on the hills, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.

Hot

Hot

Very warm conditions across the hills, hot on lower terrain. Beware of dehydration. Carry plenty of liquid.

Very Hot

Very Hot

Heatwave conditions. Very high temperatures on higher and lower ground. Beware of heat stroke and dehydration. Carry plenty of liquid.


Hazards Show More

Winter kit required

Winter kit required

Extensive frozen mountain terrain with snow cover. Safe progress will require crampons and ice-axe where necessary.

Snowdrifts

Snowdrifts

Considerable lying snow over the mountains, with substantial drifting in places.

Terrain widely frozen

Terrain widely frozen

All ground frozen from lower elevations upward, with hard frost or snow cover. Beware of icy surfaces on lower and higher terrain. Appropriate footwear needed, crampons may be necessary.

Flooding

Flooding

Fast-flowing rivers and streams. Some routes may be impassable due to flooding.

Bright winter sunshine

Bright winter sunshine

Beware of sunburn from bright sunshine over snow covered terrain.

Heatwave

Heatwave

Very high temperatures and strong sunshine, beware of sunburn, dehydration and heat exhaustion.