BIZOMAT MAKEOS · Units
Wind Chill Temperature
How cold does it feel at this air temperature and wind speed?
Wind chill equivalent temperature from air temperature and wind speed (JAG/TI 2001 formula used in North America), for outdoor work planning.
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How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Air temperature | °C | Air temperature (the formula applies at 10 °C or below). |
| Wind speed at 10 m height | km/h | Wind speed measured at 10 m (weather station height). |
What each input means
Open an input to see what it is, its units, the worked example and the common mistakes, with a small diagram.
What this means: Air temperature
- What it is
- The shade air temperature where people are exposed, from a thermometer or the local weather service.
- Units and format
- Enter a number in °C: degrees Celsius. The form accepts -80 °C to 10 °C. Required: the tool does not calculate until every input is valid.
- Example
- The form opens with -5 °C as a worked example. It is an illustration, not a recommended value: replace it with your own figure.
- Effect on the result
- A lower air temperature lowers the wind chill temperature.
- Get it right
- Use the air temperature, not the temperature of a surface in the sun. The formula only applies at 10 °C and below.
What this means: Wind speed at 10 m height
- What it is
- The wind speed as measured by a weather station at the standard 10 m height, which is higher than the wind felt at head height.
- Units and format
- Enter a number in km/h: km/h. The form accepts 0 km/h to 200 km/h. Required: the tool does not calculate until every input is valid.
- Example
- The form opens with 30 km/h as a worked example. It is an illustration, not a recommended value: replace it with your own figure.
- Effect on the result
- Above 4.8 km/h, stronger wind lowers the wind chill temperature.
- Get it right
- Use km/h: a value in m/s must be multiplied by 3.6. Below 4.8 km/h the result equals the air temperature.
Method and formulas
- WCT = 13.12 + 0.6215T − 11.37V^0.16 + 0.3965T V^0.16 (T in °C, V in km/h).
- Below about 4.8 km/h the wind chill equals the air temperature.
- Example: -5 °C with 30 km/h wind feels like -12.997 °C.
Limitations
- Valid for air temperatures of 10 °C or below and wind speeds above about 4.8 km/h.
- Sunshine, clothing and activity change actual cold stress.
- Example values are illustrations. Replace them with values for your actual task.
Typical uses
- Plan outdoor maintenance or construction work in cold wind
- Set cold-weather work rules
- Explain cold stress risk
Who it is for
- Safety officers
- Site supervisors
- Maintenance planners
What you get
- Wind chill temperature
- Wind chill in °F
Interpreting the result
- Follow your organisation’s cold-stress guidance for work and rest periods.
References
- Machinery’s Handbook, 29th edition (Industrial Press, 2012), printed pp. 2695–2697. Topic reference; no source tables or recommended settings are reproduced.
BIZOMAT tools are screening and decision-support utilities. Verify important financial, engineering, safety, legal or operational decisions using appropriate professional standards and your organisation’s approved data.