| 10 Minute Average Wind Speed |
Average wind speed
(km/t) during a 10 minute period prior to listed time. |
| Air Density |
Air density measures the mass of air present
per unit volume of air. (lb/ft³). The average density of air
is about 0.0805 lb/ft³ or 1.229 Kg/m³. The metric equivalent
of 1lb/ft³ is around 15.26 Kg/m³. |
| Atmospheric Pressure |
The pressure exerted by the weight
of the air above the observer. (1hPa = 1hectoPascal=1mbar) |
| Cooling
Degree Days |
One
cooling degree-day is the amount of cooling required to keep a
structure at 65ºF when the outside temperature remains one degree above the 65ºF threshold for 24
hours. One cooling degree-day is also the amount of cooling
required to keep that structure at 65ºF when the temperature remains
24ºF above that 65º threshold for 1 hour. |
| Dew Point |
Dew-point (C) is the temperature to which air
must be cooled for saturation (100% relative humidity) to occur,
providing there is no change in water content. |
| Heating Degree Days |
One heating degree–day is the amount of heat required to keep a
structure at 65ºF when the outside temperature remains one degree below the 65ºF threshold for 24
hours. One heating degree-day is also the amount of heat required to
keep that structure at 65ºF when the temperature remains 24ºF below
that 65º threshold for 1 hour. |
| Heat Index |
The Heat Index (C) uses the temperature and the
relative humidity to determine how hot the air actually "feels." |
| Humidity,
Relative |
Relative humidity (%) is the amount of water
vapour present in the air expressed as a percentage of the amount of
water vapour that the air is capable of holding. |
| Rainfall |
Total rainfall (mm)
during a set period of time. |
| Rainfall
Rate |
Rainfall rate (mm/hr)
is a measure of how much rain falls in a
unit of time. |
| Rain Storm |
Storm rain is the total amount (mm) of rain
falling during a period of wet weather. This
'wet weather' period starts when at least 0.5mm of rainfall is
registered by the weather station and then continues to
accumulate. The wet weather period is only ended when it is
followed by a continuous dry period of 24 hours. |
| Temperature |
A measure of the average energy of molecules in
the atmosphere. (°C) |
| Temperature-Humidity-Wind-Sun
(THWS) Index |
The Temperature-humidity-wind-wind-sun (THWS)
Index uses humidity, temperature, the cooling effects of wind and the
heating effects of direct solar radiation to calculate an apparent
temperature. |
| Temperature-Humidity-Wind (THW) Index |
The
Temperature-Humidity-Wind (THW)
Index uses temperature, humidity and wind to calculate an apparent
temperature that
incorporates the cooling effects of wind on our perception of
temperature. |
| Wind Chill |
Wind
Chill (°C) takes into account
how the speed of the wind affects our perception of the air
temperature. The faster the wind blows, the faster heat is
carried away from your body and the colder you feel. |
| Wind
Direction |
The direction from
which the wind is blowing (expressed as a compass direction). |
| Wind Run |
Wind run is a
measurement of the "amount" of wind passing the station during a given
period of time, expressed in either "miles of wind" or "kilometers
ofwind". WeatherLink calculates wind run by multiplying the average
wind speed for each archive record by the archive interval. |
| Wind Speed |
Wind speed (mps). |