Trnaby Weather Forecast

The day label given represents the local day relative to the local time for the location you are looking at.
(More Info)

This time is corrected for local time zones and where possible for daylight saving times.
(More Info)

The wind direction we use on this page is the direction the wind is coming from, given in a 16 point compass format.
(More Info)

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
(More Info)

Temperature from our forecast perspective are fairly well defined, they are what we would expect to measure in a standard meteorological screen (in other words, shaded and well ventilated) at 2 metres above ground level.
(More Info)

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
(More Info)

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
(More Info)

The total amount of cloud as a percentage is derived from looking at cloud cover throughout the atmosphere and estimating how these combine when looked at from the ground.
(More Info)

Here we try to capture the feel of the weather as an image – it will never be perfect but is useful for a quick overview.
(More Info)

When we measure for forecast air pressure we are normally doing this relative to a certain height and most commonly relative to Mean Sea Level.
(More Info)