General September Weather

[Rogue]

Have been watching a mint CB go up north of Whanganui from my place in Kapiti, Blitzortung picking up some lightning activity on it. Got a timelapse going which I will post tonight if it turns out any good. Should have chased!

[Rogue]

Anvil on the Whanganui storm today, looking north

[NZstorm]

The 500mb vortex will be over the North Island tomorrow.

[spwill]

Dry for Auckland city today, could see a few towering cumulus showers to the north and south

[tich]

In Rotorua, saw plenty of cloud buildups yesterday afternoon - looked as if building up to something, but nothing eventuated bar a few scattered showers. (not in city)

[Manukau heads obs]

@Rogue
is that a yacht club across the road...lots of wind instruments on it

[NZstorm]

Another fine day, 19C to end the month. NIWA UV for Auckland is 'high' now.

[Nev]

A cool September overall. A heavy rain event for the east from Gisborne to Marlborough (and parts of north Canterbury), otherwise dry for most of the South Island and remarkably sunny on the West Coast.

Sep 2015 Climate Anomaly Map ℅ NIWA.gif

Some preliminary September 2015 figures for the main centres:

Code: Select all

September 2015 Average Temps, Rainfall and departures from their 1981-2010 normals ℅ NIWA

Site                      T-max °C       T-min °C       T-mean °C    Rainfall mm

Auckland, Mangere        16.6  +0.3      9.7  +0.1     13.1  +0.1      89   87% 
Auckland Aero            16.1  -0.3      9.5  -0.2     12.8  -0.2     107  118% 
Tauranga Aero            16.1  -0.5      7.6  -0.7     11.9  -0.5      92  109%
Hamilton Aero            15.7  -0.6      6.1  -0.1     10.9  -0.4     163  162% 
Hamilton, Ruakura        16.4   0.0      7.1  +0.4     11.7  +0.2      97  105% 
Wellington, Kelburn      12.3  -1.4      7.2  -0.7      9.7  -1.1     103  105% 
Christchurch Aero        13.4  -1.4      3.4  -0.5      8.4  -1.0      55  135% 
Dunedin, Musselburgh     12.1  -1.1      4.8  -1.1      8.5  -1.0      28   58%
Greymouth Aero           13.4  -0.7      6.3  -0.3      9.9  -0.5     126   60%

Gisborne Aero recorded 183mm, with 131mm of that falling on the 20th and 21st. Similary, Napier Aero recorded 171mm with 97mm of that falling on the same 2 days.

[David]

For Howick, average min 8.8C, average max 16.4C, total rainfall 109mm. Pretty standard figures. Of note was that the coldest temperature was only 5.5C - no particularly cold nights all month.

[einzack]

The comment about how remarkably sunny it was on the West Coast is not an exaggeration. A stunning September was had, with the last 2 weeks in particular breathtakingly good. I don't have my stats at hand as we're mid-move so it's all packed away, but I believe my average daily max was 16.4°C which is stupidly warm. We also only had 73mm of rain which is virtually zero for these parts, particularly for spring, and when I looked at NIWA's data a week or so back it'll end up being the 2nd driest September since records began in the 1960's.

[Nev]

Here's NIWA's preliminary, 'September National Climate Summary'.

A wet end to the month for eastern North Island.


The national average temp of 9.8C was 0.9C below normal.

The month's highest temp of 25.7C was yet again recorded at Christchurch (Riccarton) on the 16th, and the lowest temp of -7.0C was recorded at Hanmer Forest on the 8th.

[Dean.]

The comment about how remarkably sunny it was on the West Coast is not an exaggeration. A stunning September was had, with the last 2 weeks in particular breathtakingly good. I don't have my stats at hand as we're mid-move so it's all packed away, but I believe my average daily max was 16.4°C which is stupidly warm. We also only had 73mm of rain which is virtually zero for these parts, particularly for spring, and when I looked at NIWA's data a week or so back it'll end up being the 2nd driest September since records began in the 1960's.

Spent a few days on the Paparoa coastline last weekend north of Punakaiki.Beautiful part of NZ with its own microclimate.Certainly noticed a big difference in warmth after arriving from a drab Canterbury under an easterly flow.

[NZ Thunderstorm Soc]

The month's highest temp of 25.7C was yet again recorded at Christchurch (Riccarton) on the 16th, and the lowest temp of -7.0C was recorded at Hanmer Forest on the 8th.

Not Riccarton again, I think the previous day was much warmer??/

[RWood]

Here's NIWA's preliminary, 'September National Climate Summary'.

A wet end to the month for eastern North Island.


The national average temp of 9.8C was 0.9C below normal.

The month's highest temp of 25.7C was yet again recorded at Christchurch (Riccarton) on the 16th, and the lowest temp of -7.0C was recorded at Hanmer Forest on the 8th.

Regarding the West Coast, again one has to note that the sunshine anomalies are for EWSs versus manual site means, so they look more impressive than they really are. But the like for like comparison should still show a substantial surplus however ...

[NZ Thunderstorm Soc]

Here are my figures for this month.

Ave temp 7.9°C
Ave Minimum 2.7°C
Ave Maximum 13.1°C
Minimum -2.2°C on the 8th (10 air frosts)
Maximum 23°C on the 15th
Rainfall 73.1mm from 17 days with 21.6mm on 20th, YTD 455.2mm

[trickytiger]

Rangitata figures this month:

Avg temp: 7.9°C
Avg Minimum: 2.9°C
Avg Maximum: 13.8°C
Minimum temp:-1.6°C on 22nd
Maximum temp: 23°C on 16th
Rainfall: 21.6mm (12 days of rain, 10.6mm on 1st) YTD 174mm (not complete as recording didn't start at start of year)