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Summit Feels-Like Calculator
It's always colder and windier on the tops. Enter the valley temperature, the fell height and the wind speed to see how cold the summit will really feel — before you set off.
Jump straight to any free Lake District tool.
From today's forecast for the nearest town.
Use the summit/mountain forecast if you have it.
Most valley starts are 50–150m. Lake level ≈ 39m.
Tap a fell below to fill this in.
On the summit it will feel like
Enter your figures above.
How the numbers are worked out
The air cools as you climb — on average around 6.5°C for every 1,000 metres you gain (the standard lapse rate). On top of that, wind strips heat away from your skin, so it feels colder still. We apply the standard wind-chill formula using the wind speed you enter. Both are guides: the real fells can be colder, wetter and windier than any single number suggests.
Disclaimer
The temperatures shown by this tool — the estimated summit air temperature, the feels-like (wind chill) figure and the temperature drop — are calculated from simple formulae and provided free of charge for general guidance only, on an “as is” basis, and are approximate.
The calculation assumes a standard fall in temperature with height of about 6.5°C per 1,000 metres and applies the standard wind-chill formula to the wind speed you enter. Real conditions on the fells vary widely: temperature inversions, wind funnelling, wet clothing, cloud and exposure can all make it feel far colder than any single figure suggests, and the actual lapse rate on the day may differ from the average used here. It is not a weather forecast.
Always check a dedicated mountain weather forecast before you set out, and carry warm and windproof clothing, spare layers, food and drink, an appropriate map and compass, a head torch and the navigation skills and experience needed for the conditions. Use of this tool is entirely at your own risk.
To the fullest extent permitted by law, TheLakeDistrict.com accepts no responsibility or liability for any loss, injury, damage, delay, accident or inconvenience arising directly or indirectly from use of this tool or reliance on the information it provides. Nothing in this disclaimer excludes or limits any liability that cannot lawfully be excluded or limited.
No account, no sign-up, no app to buy.
Load once and use it with no signal on the fells.
Nothing is stored on our servers — it stays on your device.
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Common Questions
How does it work?
It drops the valley temperature with height using the standard lapse rate of about 6.5°C per 1,000m of ascent, then applies the standard wind-chill formula at the summit using your wind speed. The result is an approximate guide.
Does it work without a signal?
Yes — the maths runs entirely in your browser, so once the page has loaded it works offline. You just need a temperature and wind figure to type in, which you'd normally check before setting off.
Can I rely on it for safety?
Treat it as a guide, not a forecast. The fells can be colder, wetter and windier than any single number suggests. Always check a proper mountain weather forecast and carry the right clothing, a map and compass, and the skills to use them.
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