Wind Chill Calculator

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🌡️ Input Parameters

📊 Results

-20
Wind Chill (°C)
-4
Wind Chill (°F)
10-30 min
Frostbite Risk
High Risk
Risk Level
LowModerateHighVery High
⚠️ Exposed skin may frostbite in 10-30 minutes. Reduce outdoor activity and dress warmly.

📖 What is Wind Chill Calculator?

The Wind Chill Calculator computes the feels-like temperature based on air temperature and wind speed, helping you understand the real sensation of cold weather exposure. It supports both the NWS/Environment Canada standard formula and the legacy Siple formula, with frostbite risk assessment and protection advice.

Core Features

How to Use

  1. Enter Temperature: Input the current air temperature in Celsius (recommended: -50°C to 10°C).
  2. Enter Wind Speed: Input the current wind speed in km/h (recommended: 4.8-100km/h).
  3. Select Formula: Default uses NWS/Canada standard; switch to Siple for comparison.
  4. View Results: Wind chill index, frostbite risk, and protection advice display instantly.
  5. Copy/Download: Save results via copy or download buttons.

Use Cases

Outdoor Sports Planning

Before skiing, hiking, or running, calculate wind chill to assess feels-like temperature and decide on gear or schedule adjustments.

Construction Safety

Assess frostbite risk for outdoor construction workers in winter to plan work hours and protective measures.

Weather Broadcasting

Weather enthusiasts and broadcasters use wind chill to communicate real cold sensation and travel advice.

School Activity Decisions

Schools use wind chill to decide whether to cancel outdoor recess or PE classes for student safety.

Background Knowledge

The wind chill concept originated from Antarctic explorer Paul Siple's 1945 research, discovering that wind significantly accelerates body heat loss. In 2001, NWS and Environment Canada jointly developed the new wind chill formula based on facial heat loss modeling and modern heat transfer theory. Formula: WC = 13.12 + 0.6215T - 11.37V^0.16 + 0.3965TV^0.16, where T is Celsius temperature and V is wind speed in km/h.

FAQ

What is Wind Chill Index?

Wind Chill Index measures the combined effect of wind and low temperature on perceived cold. Higher wind speeds accelerate body heat loss, making it feel colder than actual temperature.

What is the valid range for wind chill calculation?

The NWS/Environment Canada formula applies when temperature ≤10°C and wind speed ≥4.8km/h. Outside this range, wind chill effect is negligible.

What is the difference between wind chill and actual temperature?

Actual temperature is the thermodynamic air temperature, while wind chill is the equivalent temperature felt in wind. At -5°C with 30km/h wind, wind chill is about -13°C.

How does wind chill affect health?

Lower wind chill means higher frostbite and hypothermia risk. Below -28°C, exposed skin may frostbite in 10-30 minutes; below -40°C, 5-10 minutes.

What wind speed height should I use?

The formula uses 1.5-meter height wind speed. Weather station speeds are typically at 10 meters, about 1.5 times higher than surface-level.

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function calcWindChill() { var T = parseFloat(document.getElementById('tempInput').value); var V = parseFloat(document.getElementById('windInput').value); var formula = document.querySelector('input[name="formula"]:checked').value; if (isNaN(T) || isNaN(V)) { document.getElementById('wcValue').textContent = '--'; document.getElementById('wcFahr').textContent = '--'; document.getElementById('frostTime').textContent = '--'; document.getElementById('riskLevel').textContent = '--'; return; } var wc; if (formula === 'nws') { if (T > 10 || V < 4.8) { wc = T; } else { wc = 13.12 + 0.6215 * T - 11.37 * Math.pow(V, 0.16) + 0.3965 * T * Math.pow(V, 0.16); } } else { wc = 33 + (10.45 + 10 * Math.sqrt(V) - V) * (T - 33) / 22.04; if (V <= 0) wc = T; } wc = Math.round(wc * 10) / 10; var wcF = Math.round((wc * 9 / 5 + 32) * 10) / 10; document.getElementById('wcValue').textContent = wc; document.getElementById('wcFahr').textContent = wcF; var risk, frostTime, riskColor, advice; if (wc >= 0) { risk = 'Low Risk'; frostTime = 'No risk'; riskColor = '#10b981'; advice = '✅ Feels-like temperature is fine. Normal outdoor activities, dress warmly.'; } else if (wc >= -10) { risk = 'Low Risk'; frostTime = '>1 hour'; riskColor = '#10b981'; advice = '🟢 Feels cold. Wear warm jacket, gloves, and hat.'; } else if (wc >= -28) { risk = 'Moderate'; frostTime = '10-30 min'; riskColor = '#eab308'; advice = '🟡 Exposed skin may frostbite in 10-30 min. Reduce outdoor activity, dress warmly.'; } else if (wc >= -40) { risk = 'High Risk'; frostTime = '5-10 min'; riskColor = '#f97316'; advice = '🟠 Exposed skin may frostbite in 5-10 min. Avoid outdoor activity. Full protection needed.'; } else if (wc >= -55) { risk = 'Very High'; frostTime = '2-5 min'; riskColor = '#ef4444'; advice = '🔴 Exposed skin may frostbite in 2-5 min. Avoid all non-essential outdoor activity!'; } else { risk = 'Extreme'; frostTime = '<2 min'; riskColor = '#dc2626'; advice = '⛔ Extreme danger! Exposed skin may frostbite in under 2 min. Stay indoors!'; } document.getElementById('frostTime').textContent = frostTime; document.getElementById('riskLevel').textContent = risk; document.getElementById('riskLevel').style.color = riskColor; var pct = Math.min(100, Math.max(0, ((wc + 60) / 60) * 100)); document.getElementById('riskMarker').style.left = (100 - pct) + '%'; var adviceEl = document.getElementById('riskAdvice'); adviceEl.textContent = advice; adviceEl.style.color = riskColor; } function loadExample() { document.getElementById('tempInput').value = -15; document.getElementById('windInput').value = 40; document.querySelector('input[name="formula"][value="nws"]').checked = true; calcWindChill(); showToast('✅ Example data loaded'); } function copyResult() { var wc = document.getElementById('wcValue').textContent; var wcF = document.getElementById('wcFahr').textContent; var risk = document.getElementById('riskLevel').textContent; var frost = document.getElementById('frostTime').textContent; var text = 'Wind Chill Calculation\nTemperature: ' + document.getElementById('tempInput').value + '°C\nWind Speed: ' + document.getElementById('windInput').value + 'km/h\nWind Chill: ' + wc + '°C / ' + wcF + '°F\nFrostbite Risk: ' + risk + '\nFrostbite Time: ' + frost; navigator.clipboard.writeText(text).then(function() { showToast('✅ Copied to clipboard'); }).catch(function() { showToast('❌ Copy failed'); }); } function downloadResult() { var wc = document.getElementById('wcValue').textContent; var wcF = document.getElementById('wcFahr').textContent; var risk = document.getElementById('riskLevel').textContent; var frost = document.getElementById('frostTime').textContent; var text = 'Wind Chill Report\n==================\nTemperature: ' + document.getElementById('tempInput').value + '°C\nWind Speed: ' + document.getElementById('windInput').value + 'km/h\nWind Chill: ' + wc + '°C / ' + wcF + '°F\nFrostbite Risk: ' + risk + '\nFrostbite Time: ' + frost + '\n\nFormula: ' + (document.querySelector('input[name="formula"]:checked').value === 'nws' ? 'NWS/Environment Canada' : 'Siple (Legacy)') + '\nCalculated: ' + new Date().toLocaleString('en-US'); var blob = new Blob([text], {type: 'text/plain;charset=utf-8'}); var a = document.createElement('a'); a.href = URL.createObjectURL(blob); a.download = 'wind-chill-report.txt'; a.click(); URL.revokeObjectURL(a.href); showToast('✅ Report downloaded'); } function showToast(msg) { var t = document.getElementById('toastMsg'); t.textContent = msg; t.classList.add('show'); setTimeout(function() { t.classList.remove('show'); }, 2000); } document.addEventListener('keydown', function(e) { if (e.ctrlKey && e.key === 'Enter') { calcWindChill(); e.preventDefault(); } if (e.ctrlKey && e.shiftKey && e.key === 'C' { copyResult(); e.preventDefault(); } }; calcWindChill();)))))