Monthly Weather Review, December 2023
Published: January 1, 2024
Summary
The total rainfall was 115.3 mm, which is 181.9% above the long-term December mean rainfall.
The mean maximum temperature was 23.5° C, which is 1.2° C cooler than the long-term December mean maximum temperature.
The mean minimum temperature was 14.8° C, which is 1.0° C warmer than the long-term December mean minimum temperature.
Weather Records
The total rainfall of 115.3 mm is the highest December rainfall. The previous record was 79.1 mm in 2017.
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 performance monitoring. The daily rainfall is also routinely compared against the Melbourne Water rainfall and river level station on Skeleton Creek at Hoppers Crossing.
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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 most recent date shall supersede the previous date to conform to standard BoM practice.
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