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Velleman WS2800 Software User’s Guide User Manual

Page 24

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air can cause skin to crack and become irritated more easily. Typically however, a lower dewpoint is considered

more comfortable because of the correlation with lower temperatures.

People more used to continental climates often begin to feel uncomfortable when the

dew point reaches between 59 to 68 °F (15 and 20 °C). Most people living in these areas

will consider dew points above 70 °F (21 °C) oppressive.

In summary, it is a matter of preference whether to monitor the Outdoor Humidity or

the Dewpoint value to maintain comfort levels.

MIN AND MAX DEWPOINT

The minimum and maximum dew points are recorded and displayed in the Dewpoint section of the Heavy

Weather Pro application. To view or reset the min and max dewpoint values,

see the section on Min Max Values

.

WINDCHILL

WHAT IS WIND CHILL?

Wind Chill

is the perceived temperature felt on exposed skin due to wind. How much is effects us depends on both

air temperature and wind speed. The wind chill temperature (often called just the wind chill factor) is always lower

than the air temperature for values where the wind chill formula is valid.

Note: Wind Chill measurement methods vary over time, as established by the National Weather Service and other

weather reporting authorities. This weather station uses the classical wind chill values.

HOW DOES WIND CHILL AFFECT ME?

The human body loses heat largely by evaporative cooling and convection. The rate of heat loss by a surface

depends on the wind speed above that surface: the faster the wind speed, the better the surface cools.

For inanimate objects, the effect of wind chill is to reduce any warmer objects to the

ambient temperature more quickly.

For people, the body’s response is to try to maintain surface (skin) temperature in an

acceptable range so as to avoid adverse effects. This attempt to maintain a warm skin

surface temperature in an environment of faster heat loss makes it feel colder, and

can actually cause the skins temperature to decrease, increasing the risk of frostbite.

Note: Monitoring Wind Chill is an important safety factor in colder seasons.