Version 1.10 ©Copyright 2020, Ambient LLC. All Rights Reserved. Page 54
The dew point is the temperature at which a given parcel of humid air must be cooled, at
constant barometric pressure, for water vapor to condense into water. The condensed water is
called dew. The dew point is a saturation temperature.
The dew point is associated with relative humidity. A high relative humidity indicates that the
dew point is closer to the current air temperature. Relative humidity of 100% indicates the dew
point is equal to the current temperature and the air is maximally saturated with water. When
the dew point remains constant and temperature increases, relative humidity will decrease.
The Feels Like temperature is a combination of Heat Index when it is hot outside, and Wind
Chill when it is cold outside.
Wind Chill temperature is defined by the National Weather Service for temperatures at or
below 40 °F and wind speeds above 5.0 mph.
Heat Index is not valid or calculated below 80 degF.
Thus, when the outdoor temperature is between 40 degF and 80 degF, the feels like
temperature is the same as the outdoor temperature.
If the temperature is below 40 degF, the feels like temperature is the same as the outdoor
temperature when the wind speed is less than 5 mph.
Pressure units in SI (international system) units of measurement. Same as millibars (1 hPa = 1
mbar)
A hygrometer is a device that measures relative humidity. Relative humidity is a term used to
describe the amount or percentage of water vapor that exists in air.
Pressure in Imperial units of measure.
1 inch of mercury = 33.86 millibars
A rain gauge is a device that measures liquid precipitation (rain), as opposed to solid
precipitation (snow gauge) over a set period.
All digital rain gauges are self-emptying or self-dumping (also referred to as tipping rain
gauge). The precision of the rain gauge is based on the volume of rain per emptying cycle.
Range is defined as the amount or extent a value can be measured.
Relative Barometric
Pressure
Measured barometric pressure relative to your location or ambient conditions.
Resolution is defined as the number of significant digits (decimal places) to which a value is
being reliably measured.
A solar radiation sensor measures solar energy from the sun.
Solar radiation is radiant energy emitted by the sun from a nuclear fusion reaction that creates
electromagnetic energy. The spectrum of solar radiation is close to that of a black object with a
temperature of about 5800 K. About half of the radiation is in the visible short-wave part of the
electromagnetic spectrum. The other half is mostly in the near-infrared part, with some in the
ultraviolet part of the spectrum.
A thermometer is a device that measures temperature. Most digital thermometers are resistive
thermal devices (RTD). RTDs measure changes in temperature as a function of electrical
resistance.
A wind vane is a device that measures the direction of the wind. The wind vane is usually
combined with the anemometer. Wind direction is the direction from which the wind is
blowing.
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