| Environmental Setting | WNP Wharekirauponga Underground Mine - Assessment of Effects of Discharges to Air | 4397169-66885702-23 | | 25 Figure 3-4 Windrose showing winds >5m/s at OGNZL Barry Road Climate Station 1 January 2013 to 31 December 2019 (data supplied by OGNZL). 3.5.1 Rainfall The long term annual average rainfall measured by NIWA at Waihi (between 1907 and 2020) is 2094 mm8. The average monthly rainfall measured at Waihi for the period 2013 – 2020 is shown in Figure 3-5 and the average number of rain days measured at Waihi, for the same period, is shown in Figure 3-6. A “rain day” is defined as a day when at least 1mm of rain is recorded. During these days, the exposed surfaces would be expected to remain moist and therefore have a lower potential to generate dust. An average 150 rain days occurred each year over a 14-year monitoring period (i.e rain days occurred for approximately 41% of the time). Annually, the number of rain days per year varied between 103 and 169 days. The highest frequency of rain days occurred between July and September (rain days occurred for approximately 55% of the time), and the lowest frequency occurred during January to March (rain days occurred for approximately 30% of the time). 8 Information sourced from the NIWA Cliflo database
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