Monthly Weather Review, April 2023
May 4, 2023
Summary
The total rainfall was 58.9 mm. This is 120.9% of the long-term April mean.
The mean maximum temperature was 20.6° C. This is 0.3° C cooler than the long-term April mean.
The mean minimum temperature was 11.7° C. This is 0.4° C warmer than the long-term April mean.
Weather Records
The minimum temperature of 3.6° C on the 30th is the lowest temperature recorded in April. The previous record was 4.6° C on 18 April 2018.
The mean temperature of 10.2° C on the 30th is the coolest daily mean temperature recorded in April. The previous record was 10.7° C on 21 April 2021.
The mean sea level pressure of 1035.2 hPa on the 23rd equals the highest pressure recorded in April. The record was originally set on 24 April 2022.
Monthly Review
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Monthly Meteograms
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Performance Monitoring
The daily rainfall and temperature data are routinely compared against the BoM AWS at Laverton for quality assurance. The daily rainfall is also routinely compared against the Melbourne Water rainfall and river level station on Skeleton Creek at Hoppers Crossing (Hoppers in the table below).
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Units of Measurement
Unless otherwise advised, temperature is given in degrees Celsius (° C) and rainfall in millimetres (mm).
Observation Times & 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.
Climatology & Station Records
Our climatology and station records are based on all available data since 1 April 2017. All annual data are based on complete calendar years commencing in 2018. If a station record is equalled, the date shall be the most recent occasion to conform to standard BoM practice.
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