Winter sunrises and aurora nights are cold — and wind makes them colder. Enter air temperature and wind speed to get the National Weather Service wind chill.
How it works
WC = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275T·V^0.16 (°F, mph; valid T ≤ 50 °F, V ≥ 3 mph).
FAQ
How do I keep batteries warm?
Carry spares in an inside pocket and swap them; cold batteries recover when warmed.
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