Nine extreme rainfall shortages persisted at Manilla in May, one fewer than in April. No serious shortages occurred at 9-months or less. However, the 12-month total (440 mm) once again became a serious shortage (9th percentile).
The two rainfall totals nearest to record values for dryness were those that made new records most recently. The 42-month total of 1485 mm (2nd driest) had reached the record value of 1468 mm in April, while the 96-month total of 4141 mm (4th driest) had reached the record value of 4104 mm in February.
How to read the graph
This graph shows all the present rainfall shortages at Manilla, short term and long term, as percentile values. The latest values are shown by a thick black line with large circles. Those from one month earlier are shown by a thinner line with small diamonds. [The method is described in “Further Explanation” below.]
The following notes explain aspects of this work under these listed headings:
Cumulative rainfall totals
Severity of rainfall shortages
Limitations of this analysis
Monthly rainfalls form a single population
Observations are not retrospective
The rain gauge failed