風冷計算機

Calculate wind chill (feels-like temperature in cold weather), or reverse-solve for temperature or wind speed. Includes frostbite risk categories.

計算する

Must be ≤ 50 °F (10 °C)

Must be ≥ 3 mph

Choose a calculation type, enter your values, and click Calculate Now to see wind chill results with risk categories and step-by-step solutions.

完全なユーザーガイド

ウィンドチルとは何ですか？

Wind chill is the perceived decrease in air temperature felt by the body on exposed skin due to air flow. Wind increases the rate of heat loss from the body, making the temperature feel colder than the actual air temperature. The NWS Wind Chill Index uses a formula based on advances in science, technology, and computer modelling to provide an accurate way to measure cold-weather risk.

NWS Wind Chill Formula

WC = 35.74 + 0.6215×T − 35.75×V0.16 + 0.4275×T×V0.16

Where T = air temperature (°F), V = wind speed (mph)

T ≤ 50 °F および V ≥ 3 mph の場合に有効

3 Calculation Types

ウィンドチル

Enter air temperature and wind speed. Get feels-like temperature + risk.

Temperature from WC

Enter wind chill and wind speed. Finds actual air temperature.

Wind Speed from WC

Enter wind chill and temperature. Finds wind speed using iterative solving.

Wind Chill Risk Categories

Wind Chill (°F) カテゴリ Effect
≥ 32ちょっとした危険Little danger for properly clothed person.
0 – 31注意Risk of hypothermia with prolonged exposure.
−1 – −20危険Exposed skin can freeze in 10 minutes.
−21 – −40High DangerExposed skin can freeze in 5 minutes.
< −40極度の危険Exposed skin can freeze in under 2 minutes.

重要な注意事項

  • Wind chill only applies when T ≤ 50 °F (10 °C) and V ≥ 3 mph.
  • Wind chill only affects exposed skin, not inanimate objects.
  • Dress according to wind chill, not just air temperature.
  • サポートされている風速単位: mph、km/h、m/s。

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