There were fourteen rainy days in a month that ended no warmer than it began. The month of September normally warms up by nearly four degrees. This time it remained near 14° all month. Some plants encouraged by the plentiful moisture were discouraged by the cold.
The highest daily rainfall reading, 28.8 mm on the 14th, hardly compares with one of 71.1 mm in 2005, or even one of 40.0 mm in 2011.
No days were warm. For the first time in this 18-year record, no September day reached 25°. More days than ever (18) were below 20° but not one was as low as 15°. Temperatures at night were near normal. A frost on the 5th was the only one. It may have been the last of the year, about a fortnight earlier than usual.
Only four mornings this month had no cloud, while seven were totally overcast.
Comparing September months
For monthly average temperatures, the daily maximum of 19.7° stands out as a record low, 4.1° below normal. Three indicators for moisture reached their extreme September values for the new century: rainfall, percentage of cloudy mornings (63%), and (narrowest) daily temperature range (12.0°). Dew point (6.0°) was just above normal, but very much higher than in September months since 2010.
The monthly rainfall total of 122.4 mm (amended) was one of the four highest ever September readings. The others were: 1917: 124 mm; 1949: 126 mm; 1998: 166 mm.
There are not now any noteworthy shortages in rainfall totals for any number of months, up to 360 months (thirty years).
Data. Rainfall figures for this month are from the automatic rain gauge at Manilla, published on the internet by the Bureau of Meteorology as Station 55031. All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.
One thought on “September 2016 had near-record rain”
According to the popular press, this has been a near-record year for near records, and researchers have sprung the BoMsite quietly manipulating the far records. DD