Monthly Weather Review, December 2025
Issued: 1 January 2026
On this page:
Overview
Records
Summary
Meteograms
Monitoring
Notes
Overview
The total rainfall was 28.1 mm. This is 78% of the long-term median rainfall for December.
The mean maximum temperature was 25.1° C. This is 0.3° C warmer than the long-term mean maximum temperature for December.
The mean minimum temperature was 12.3° C. This is 1.8° C cooler than the long-term mean minimum temperature for December.
Records
The mean minimum temperature of 12.3° C is a new record for the coolest December mean minimum temperature. The previous record was 12.6° C in 2020.
Summary
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Meteograms
Click on a graph to see it displayed at full-size
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Monitoring
The table below lists our daily data alongside the equivalent data from nearby official stations. The official rainfall stations are the BoM AWS at Laverton RAAF and the Melbourne Water rain gauge at Hoppers Crossing. The official temperature data are from the BoM AWS at Laverton RAAF, Avalon Airport and Point Cook RAAF.
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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.
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 record shall pass to the most recent date to conform to standard BoM practice.
Variation from climatology: This is a measure of the difference between the current month and the long-term average for that month. For most meteorological elements, the mean of the values recorded over many years is the standard measure of the average. For rainfall however, particularly if there is a small volume of available data, the median is the preferred measure of the average due to the high variability of rainfall. The median is less affected by extreme rainfall events than the mean.
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