How to Use the Outdoor Activity Windchill Calculator
The same air temperature can feel very different depending on wind and humidity, changing how suitable it really is for a run, walk, or workout outside. This calculator takes temperature, wind speed, and humidity to compute the apparent temperature and rate today on a six-level scale for outdoor activity.
The apparent temperature uses the Australian Bureau of Meteorology's formula (AT = temp + 0.33×vapor pressure − 0.70×wind speed − 4.0), reflecting how higher humidity slows sweat evaporation and makes it feel hotter, while stronger wind makes it feel colder. An apparent temperature of 59-81°F is the comfortable range for outdoor activity, with higher or lower values flagged as caution or danger for heat or cold. Actual comfort varies by clothing, sun exposure, and individual tolerance, so treat this as a reference estimate.
Frequently Asked Questions
It uses the Australian Bureau of Meteorology apparent temperature formula, factoring in vapor pressure from temperature and humidity plus wind speed.
An apparent temperature of 59-81°F is comfortable; higher grades warn of heat, lower grades warn of cold.
High humidity slows sweat evaporation, making it feel hotter than the actual air temperature.