Weather and Garden: Wind Chill, Heat Index and Watering
The numbers behind the weather and a thriving garden — how wind chill and heat index work, what dew point tells you, when each becomes dangerous, and how to water and harvest rain.
Wind Chill Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Wind chill (feels like)
-6.5
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Wind Chill Calculator
The Wind Chill Calculator works out your wind chill (feels like) in an instant. Enter air temperature and wind speed and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the air temperature.
- Enter the wind speed.
- Read off your wind chill (feels like) — the calculator updates automatically, with no button to press.
Formula
The Wind Chill Calculator uses the formula:
Wind chill (feels like) = 13.12 + 0.6215 × Air temperature - 11.37 × (Wind speed)^(0.16) + 0.3965 × Air temperature × (Wind speed)^(0.16)
Worked example
For example, with air temperature of 0 °C and wind speed of 30 km/h, the wind chill (feels like) is -6.5.
| Air temperature | 0 °C |
|---|---|
| Wind speed | 30 km/h |
| Wind chill (feels like) | -6.5 |
|---|
Results are estimates for educational use, not professional advice.
Frequently asked questions
Wind chill is how cold it feels when wind is factored in, since moving air carries heat away from the body faster. At 0°C with 30 km/h wind it feels about −6°C.
It uses an internationally agreed formula combining air temperature and wind speed. This tool applies the metric version (°C and km/h).
Wind chill is meaningful at low temperatures, generally below about 10°C with noticeable wind. It does not apply in warm weather.
No. Wind chill describes heat loss from warm bodies. It cannot cool an object below the actual air temperature.
Enter the air temperature. Enter the wind speed. Read off your wind chill (feels like) — the calculator updates automatically, with no button to press.
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