NZ Weather Forum

Sept Stats

Mean daily temp 13.5c , 0.8 above average
Rainfall 43.8mm, well below the 106mm average
Windiest month recorded so far this year

YTD
Mean daily temp 16.3, 1.4c above normal
Rainfall 1083mm, 167mm ahead of average.

Stats from Howick for Sep 2018:

Mean temp = 12.4C
Mean daily max = 16.7C
Mean daily min = 8.7C
Warmest temp = 21.6C (20th)
Coldest temp = 4.1C (4th)

Total rain = 58mm
YTD = 1325mm

A fairly sunny and dry month for most, except for rainfalls in the lower-eastern North Island and inland Otago. A cold start was balanced by generally milder temps during the rest of the month.


Some very preliminary September 2018 figures for the main centres:
Note that NIWA's Mangere temps still appear to be way too low compared to nearby sites.

Reading for Sep were - Rainfall 22.4mm
Low temp -3.4 8th
High temp 22.4 15th

Nev wrote:A fairly sunny and dry month for most, except for rainfalls in the lower-eastern North Island and inland Otago. A cold start was balanced by generally milder temps during the rest of the month.

Sep 2018 Climate Anomaly Maps ℅ NIWA.gif

Some very preliminary September 2018 figures for the main centres:

Code: Select all

Sep 2018 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       15.9  -0.4     8.8  -0.8    12.4  -0.6     45   44%    157  104%
Auckland Aero           16.6  +0.2     9.6  -0.1    13.1  +0.1     46   51%
Tauranga Aero           17.2  +0.6     8.6  +0.3    12.9  +0.5     33   40%    n/a   n/a
Hamilton Aero           16.9  +0.6     6.0  -0.2    11.4  +0.1     57   57%
Hamilton, Ruakura       18.0  +1.6     6.3  -0.4    12.1  +0.6     53   58%    176  120%
Wellington, Kelburn     13.4  -0.3     8.0  +0.1    10.7  -0.1    106  108%    163  100%
Christchurch Aero       14.5  -0.3     3.9   0.0     9.2  -0.2     37   91%    n/a   n/a
Dunedin, Musselburgh    13.4  +0.2     5.6  -0.3     9.5   0.0     50  104%    206  153%
Greymouth Aero          13.7  -0.4     6.3  -0.3    10.0  -0.3     79   38%    192  145%

Note that NIWA's Mangere temps still appear to be way too low compared to nearby sites.

The Ruakura Tmax looks high but agrees with the output from Cliflo. 22.0C on 17th and 23.0C 20th lifted the average. Was a notable run of early Spring warmth that week.

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Nev wrote:A fairly sunny and dry month for most, except for rainfalls in the lower-eastern North Island and inland Otago. A cold start was balanced by generally milder temps during the rest of the month.

Sep 2018 Climate Anomaly Maps ℅ NIWA.gif

Some very preliminary September 2018 figures for the main centres:

Code: Select all

Sep 2018 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       15.9  -0.4     8.8  -0.8    12.4  -0.6     45   44%    157  104%
Auckland Aero           16.6  +0.2     9.6  -0.1    13.1  +0.1     46   51%
Tauranga Aero           17.2  +0.6     8.6  +0.3    12.9  +0.5     33   40%    n/a   n/a
Hamilton Aero           16.9  +0.6     6.0  -0.2    11.4  +0.1     57   57%
Hamilton, Ruakura       18.0  +1.6     6.3  -0.4    12.1  +0.6     53   58%    176  120%
Wellington, Kelburn     13.4  -0.3     8.0  +0.1    10.7  -0.1    106  108%    163  100%
Christchurch Aero       14.5  -0.3     3.9   0.0     9.2  -0.2     37   91%    n/a   n/a
Dunedin, Musselburgh    13.4  +0.2     5.6  -0.3     9.5   0.0     50  104%    206  153%
Greymouth Aero          13.7  -0.4     6.3  -0.3    10.0  -0.3     79   38%    192  145%

Note that NIWA's Mangere temps still appear to be way too low compared to nearby sites.

Wonder what's causing the Mangere anomoly? And why has it not been investigated? Hate to see bad data go into official records.

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Reading for Sep were - Rainfall 45mm over 9 days
Low temp was minus 2C Fri 7th
High temp 24.6 Sat 15th
9 frosts.

cbm wrote: ↑Wed 03/10/2018 13:18The Ruakura Tmax looks high but agrees with the output from Cliflo. 22.0C on 17th and 23.0C 20th lifted the average. Was a notable run of early Spring warmth that week.

Yes, Ruakura's 23.0C on the 20th equaled its 1973 Sep record, since records began there in 1906. And its average T-max of 18.0C was 2nd only its 2013 record of 18.2C.

Also according to NIWA's September 2018 National Climate Summary, the month's national average temp of 10.5C was equal to its 1981-2010 average. The month's highest temp of 25.8C was recorded at Wairoa on the 13th, and the lowest temp of -6.5C was recorded at Mt Cook Aero on the 6th.

cbm wrote: ↑Wed 03/10/2018 13:22 Wonder what's causing the Mangere anomoly? And why has it not been investigated? Hate to see bad data go into official records.

I wrote to NIWA and their 'technical team' is to 'follow it up'.