Exploration & description/Monthly rainfall

The next step is to look at monthly totals of rainfall They can be summarised in various ways (Stern et al. 2006). one example is given below. We notice that, although the highest average monthly rainfall of 211.1 mm occurred in January, there is high variability over the years (range 30 - 520 mm). The first column gives the number of years in which total monthly rainfall was at least 10mm. The months between June and August are not included in the table as total rainfalls in each of these months were <10 mm in every year.

Total Monthly Rainfall (mm) for the months Sept - May
Period: 1922 – 2003
Month	No. of years with >10 mm in the month	Mean	Min.	Max.	SDE
September	5	18.5	12.2	30	6.79
October	43	33.3	10.7	126.3	26.07
November	82	91.1	19.9	338	58.79
December	82	189.4	29.0	425.6	91.71
January	82	211.1	30.4	520.3	95.03
February	82	169.1	20.1	505	89.92
March	78	103.8	15.8	371.2	69.67
April (1)	42	36.4	11.2	147.9	28.35
May (1)	11	27.2	12.0	67.1	15.87