Monthly Weather Review, May 2025
Published: 1 June 2025
Summary
The total rainfall was 14.8 mm, which is 34% of the long-term median rainfall for May.
The mean maximum temperature was 19.2° C, which is 2.0° C warmer than the long-term mean maximum temperature for May.
The mean minimum temperature was 7.8° C, which is 0.6° C cooler than the long-term mean minimum temperature for May.
Weather Records
The total rainfall of 14.8 mm is a new record for the lowest May rainfall. The previous record was 20.0 mm in 2017.
The minimum temperature of 18.0° C on the 6th is a new record for the warmest May daily minimum temperature. The previous record was 16.4° C on 2 May 2019.
The mean temperature of 22.7° C on the 6th is a new record for the warmest May daily mean temperature. The previous record was 20.7° C on 2 May 2021.
The mean temperature of 8.2° C on the 19th is a new record for the coolest May daily mean temperature. The previous record was 8.3° C on 30 May 2022.
The mean maximum temperature of 19.2° C is a new record for the warmest May mean maximum temperature. The previous record was 18.0° C in 2019.
The mean minimum temperature of 7.8° C supersedes the record for the coolest May mean minimum temperature. The previous record was in 2021.
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 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 most recent date shall supersede the previous 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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