NZ Weather Forum

Awhituobs wrote: ↑Fri 01/11/2019 13:12 The Davis rain gauge does tend to under read by 5%

David wrote: ↑Fri 01/11/2019 14:24

Awhituobs wrote: ↑Fri 01/11/2019 13:12 The Davis rain gauge does tend to under read by 5%

Since are worse than that, when I calibrated mine about 7 years back I found it to be reading over 10% lower than the manual gauge I used for reference, over a period of months.

Willoughby wrote: ↑Fri 01/11/2019 14:50 Can't you just adjust the screws on the Davis rain gauges to calibrate?

David wrote: ↑Fri 01/11/2019 17:42 With regards to the manual gauge I used it wasn't a wedge, but funneled the rain drops down into an enclosed tube, so evaporation shouldn't have been any issue. Model is nylex 1000

MetService October 2019 Summary - 'Low pressures targeted New Zealand'

Weather patterns were unsettled, and a real mixed bag, during October. The month was characterised by much lower pressures than usual over New Zealand. October started off with cold southerlies, before the Tasman Sea delivered a couple of rainmaker lows (bringing rain to eastern areas) through the middle of the month. Stormy westerly gales kicked in with a vengeance during the last 10 days of October.

Not surprisingly, temperatures bounced around. The month started out an exceptionally cold, nationally, but subsequent warmer spells meant that the October monthly average temperature ended up near average for most North Island regions. In contrast, monthly temperatures were below average across most of the South Island, most notably in the east.

It was a wetter than usual October along the eastern coastline of both Islands (excluding the Kaikoura Coast), as well as the west and south of the South Island. In contrast, the western North Island ran a touch drier than usual, while Nelson and Marlborough recorded near average totals.

Oct 2019 Average Temps, Rainfall, Sunshine and departures from 1981-2010 normals ℅ NIWA

Site                     T-max °C      T-min °C      T-mean °C     Rain mm      Sun hrs

Auckland, Mangere       17.8  +0.2    11.6  +0.5    14.7  +0.3     75   83%    188  107%
Auckland Aero           17.7   0.0    11.6  +0.4    14.6  +0.1     69   73%
Tauranga Aero           18.5  +0.4    10.1   0.0    14.3  +0.2     91  102%    n/a   n/a
Hamilton Aero           17.9  -0.1     8.7  +0.7    13.3  +0.3     56   57%
Hamilton, Ruakura       17.7  -0.3     9.0  +0.6    13.3  +0.1     66   72%    154   87%
Wellington, Kelburn     15.0  +0.1     8.7  -0.3    11.8  -0.2    122  104%    191   99%
Christchurch Aero       16.3  -0.6     5.1  -0.9    10.7  -0.7     61  124%    201   99%
Dunedin, Musselburgh    13.7  -1.0     6.9  -0.2    10.3  -0.6    121  196%    171  102%
Greymouth Aero          15.0  -0.1     7.5  -0.5    11.2  -0.4    307  136%    187  119%