What is the wind chill?

One of the things you will see in my forecasts especially in the winter months and early spring time, is the words it will feel colder in the wind chill.

For example on the 13th March we have some blustery winds gusting to 40 mph. But as its mid march we also have some milder temperatures.

This afternoon we are seeing temperatures reaching 7/8C with a wind chill of 2/3C but as the temperature drops this evening the wind chill will drop further. Temps of 3C to 7C with winds gusting to 30 to 40 mph wind chill will drop down to 2C to -1C.

In the winter time here in the Western Isles we can see winds gusting 60 to 70 mph coming down from the North with wind chill dropping down -12C to even -18C in the past events.

The ‘feels like’ temperature is different to the actual air temperature shown on a weather forecast. The ‘feels like’ temperature measures the expected air temperature, relative humidity and the strength of the wind at 5 feet (human height) as well as an understanding of how heat is lost from the human body during cold and windy days.

This Met Office video explains it in greater depth

The Met Office explains how they measure the wind chill ( feels like) for here in the UK

“There is no official definition of wind chill and definitions vary globally, dependent on how it is measured. In the UK, a system called the Joint Action Group for Temp Indices is used to realistically measure wind chill. This calculates wind chill by measuring how much heat is lost from a person’s bare face at a walking speed of 3mph.

A formula is used to measure ‘feels like’ temperature using the actual air temperature and adjusting this with the understanding of wind chill when the temperature is low and the heat index when temperatures are higher. When temperatures are average, a combination of both is used.”

The above quotes come from here https://www.metoffice.gov.uk/weather/learn-about/weather/types-of-weather/wind/wind-chill-factor

The Met Office tweeted this out about Wind Chill today.

Hopefully this blog explains more about Wind Chill.

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