Large data set Flashcards
What is daily mean temperature
The average of the hourly temperature readings during a 24 hour time period
What is rainfall
Rainfall includes solid precipitation such as snow and hail which is melted before being included in any measurements
What are rainfall amounts less than 0.05mm recorded as
Recorded as ‘tr’ or ‘trace’
What is daily total sunshine recorded to
Recorded to the nearest tenth of an hour
What are the only data recorded for oversees locations
- Daily mean temperature
- Daily mean pressure
- Daily mean windspeed
- Daily total rainfall
What is daily mean wind direction and windspeed recorded in
Windspeed is recorded in knots averaged over 24 hours from midnight to midnight
Mean wind directions are given as bearings and as compass directions
What is the Beaufort scale
A way of categorising mean windspeed
What does a Beaufort scale of 0 mean
That the average speed at 10m above the ground is less than 1 knot and the environment is described as ‘calm’
What does a Beaufort scale of 1-3 mean
That the average speed at 10m above the ground is 1 to 10 knots and the environment is described as ‘Light’
What does a Beaufort scale of 4 mean
That the average speed at 10m above the ground is 11 to 16 knots and the environment is described as ‘Moderate’
What does a Beaufort scale of 5 mean
That the average speed at 10m above the ground is 17 to 21 knots and the environment is described as ‘Fresh’
What is daily maximum gust
The highest instantaneous windspeed recorded
In the daily maximum gust reading, what else is recorded other than windspeed
The direction from which the maximum gust was blowing from
What is daily maximum relative humidity measured as
Given as a percentage of air saturation with water vapour
What conditions do relative humidity’s above 95% give rise to
Give rise to misty or foggy conditions
