We have examined the day-of-the-week variation of rainfall and maximum temperature using 26 years of record at Melbourne, Australia. The summer and winter half-years were considered separately. Analysis of variance revealed no significant differences between the days. However, in the winter season, precipitation shows a monotonic increase from Sunday to a maximum on Thursday, while maximum temperature shows a monotonic decrease from Monday to a Saturday minimum. Winter weekday precipitation is significantly (at the 5% level) greater than weekend precipitation, the reason for which seems to be atmospheric pollution. The out-of-phase relationship between precipitation and maximum temperature in winter appears to be due to the increased cloud cover associated with rainfall events. Our results suggest that the pollution level has little effect on the maximum temperature.
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