Monthly Weather Review, April 2017
Issued: May 1, 2017
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» Overview
» Summary
» Meteograms
» Monitoring
» Notes
Overview
The total rainfall was 113.1 mm. The long-term April mean for the nearby BoM AWS at Laverton is 45.0 mm.
The mean daily maximum temperature was 20.6° C. The long-term April mean for the nearby BoM AWS at Laverton is 20.2° C.
The mean daily minimum temperature was 11.5° C. The long-term April mean for the nearby BoM AWS at Laverton is 9.9° C.
Summary
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Meteograms
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Monitoring
To check for consistency with nearby official stations, the daily maximum and minimum temperatures from the AWS are routinely compared against the BoM AWS at Laverton RAAF, whilst the daily rainfall from the standard rain gauge is compared against the BoM AWS at Laverton RAAF and the Melbourne Water rain gauge at Hoppers Crossing.
Note: Tr indicates a rainfall amount of less than 0.1 mm (a trace of rain) and does not count towards the monthly rainfall total or the number of rain days.
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Notes
Units of Measurement
Unless otherwise advised, temperature is given in degrees Celsius (° C) and rainfall in millimetres (mm).
Observation Times and Reporting Periods
The main observation for the day is at 9 am when the precipitation over the past 24 hours is determined, and the maximum and minimum thermometers are also read and reset. The following conventions are used for assigning dates to the observations made:
- Maximum temperature : the 24 hours from 9 am on the date the data are recorded. The maximum temperature will usually occur in the afternoon of that day.
- Minimum temperature : the 24 hours to 9 am on the date the data are recorded. The minimum temperature will usually occur in the morning of that day.
- Mean temperature : the average of the daily maximum and minimum temperatures on the date the data are recorded.
- Daily rainfall : the 24 hours to 9 am on the date the data are recorded. A significant portion of the rain may have occurred on the previous calendar day.
- Monthly rainfall : from 9 am on the last day of the previous month to 9 am on the last day of the current month.
- Phenomena : the 24 hours to midnight on the date the data are recorded.
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