General August Weather

[NZstorm]

Looks like a fine weekend coming up which will be a welcome change from the unsettled August pattern.
Only 2 days without rain measured at Auckland airport this month.

[NZ Thunderstorm Soc]

Overcast and drizzly after being a nice pleasant day.
I hope we don't get changes like that here with the upcoming SSW event for the next cupla months?
I see the Rakaia radar is down again.

[Cyclone Tracy]

August 2019 stats –

Mean daily temp = 12.2 (around 1c above normal) Max 15.5 Min 9.2
Rainfall = 156mm (42mm above local average)
Prevailing wind WSW
5 thunder days.
YTD daily mean temp = 14.95c (Around 1.2c above normal). Still 0.2c less than to 31 August, 2018.
YTD rainfall = 531mm. 280mm under local average of 811mm to end of August.

No records

[melja]

I would class August as a very settled month here in Rangiora (Chch area) with just 41mm of rain, 15days of the daily high 15C or above. Lovely late winter weather!

Sent from my Redmi Note 4 using Tapatalk

[David]

August 2019 stats for Howick

Mean temp = 11.2C
Mean daily max = 15.2C
Mean daily min = 7.9C
Highest temp = 18.9C (11th)
Lowest temp = 1.8C (19th)
Rainfall = 175mm

[Nev]

A relatively mild August overall, generally wetter in the west and dryer in the east, but also fairly sunny for most areas.

Aug 2019 Climate Anomaly Maps ℅ NIWA.gif

Some very preliminary Aug 2019 figures for the main centres:

Code: Select all

Aug 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       15.3  +0.3     9.1  +0.9    12.2  +0.6    168  149%    156  106%
Auckland Aero           15.1  +0.2     9.1  +0.9    12.1  +0.5    189  171%
Tauranga Aero           15.5  +0.7     7.9  +1.2    11.7  +0.9     74   67%    n/a   n/a
Hamilton Aero           14.6  -0.1     5.9  +1.4    10.3  +0.7    131  109%
Hamilton, Ruakura       14.7  +0.1     6.4  +1.4    10.6  +0.8    133  121%    145  101%
Wellington, Kelburn     12.6* +0.4     6.8* +0.1     9.7* +0.3     99*  85%    166  112%
Christchurch Aero       13.5  +1.1     0.8  -1.2     7.1  -0.1     40   64%    205  133%
Dunedin, Musselburgh    12.1  +0.9     3.8  -0.4     8.0  +0.1     50   90%    157  129%
Greymouth Aero          13.0  +0.2     3.1  -2.0     8.0  -0.9    290  151%    139  109%

* Missing 1 day's data (Edit: updated Chch Sun hrs)

[NZ Thunderstorm Soc]

Got 81.6mm here compared to MS 53.4mm at Levels, 51mm at Ashburton airport and 44.2mm at Harewood airport in Christchurch.

[Chris Raine]

Thornbury monthly rainfall was 125.6mm

[RWood]

A relatively mild August overall, generally wetter in the west and dryer in the east, but also fairly sunny for most areas.


Aug 2019 Climate Anomaly Maps ℅ NIWA.gif


Some very preliminary Aug 2019 figures for the main centres:

Code: Select all

Aug 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       15.3  +0.3     9.1  +0.9    12.2  +0.6    168  149%    156  106%
Auckland Aero           15.1  +0.2     9.1  +0.9    12.1  +0.5    189  171%
Tauranga Aero           15.4  +0.6     7.9  +1.2    11.7  +0.9     74   67%    n/a   n/a
Hamilton Aero           14.6  -0.1     5.9  +1.4    10.3  +0.7    131  109%
Hamilton, Ruakura       14.7  +0.1     6.4  +1.4    10.6  +0.8    133  121%    145  101%
Wellington, Kelburn     12.6* +0.4     6.8* +0.1     9.7* +0.3     99*  85%    166  112%
Christchurch Aero       13.4  +1.0     0.8  -1.2     7.1  -0.1     40   64%    198* 129%
Dunedin, Musselburgh    12.2  +1.0     3.8  -0.4     8.0  +0.3     50   90%    157  129%
Greymouth Aero          13.0  +0.2     3.1  -2.0     8.0  -0.9    290  151%    139  109%

* Missing 1 day's data

Note that Kelburn AWS (with one day estimated for missing data) will come in with about 185 hours' sunshine.

[Richard]

Aug recordings -
max temp- 18.2 on the 31th
min " --4.4 on the 19th
Rainfall total 30.6mm

[Nev]

Note that Kelburn AWS (with one day estimated for missing data) will come in with about 185 hours' sunshine.

NIWA are still using the manual readings in their latest summaries. But yes, the Kelburn AWS's new sunshine recorder looks to be running about 10-25% higher than its manual C/S recorder over the last 3 months. I guess the odd 'burn-card' being blown away would no longer be an issue though... lol . I believe Tauranga and Christchurch also still use manual C/S readings.

[Chris Raine]

As does Invercargill.Daily manual climate ob. at 0900 each day

[RWood]

Note that Kelburn AWS (with one day estimated for missing data) will come in with about 185 hours' sunshine.

NIWA are still using the manual readings in their latest summaries. But yes, the Kelburn AWS's new sunshine recorder looks to be running about 10-25% higher than its manual C/S recorder over the last 3 months. I guess the odd 'burn-card' being blown away would no longer be an issue though... lol . I believe Tauranga and Christchurch also still use manual C/S readings.

Yes, Tauranga, Ch'ch and Alexandra are still C/S only - all disadvantaged in comparisons at present. Suddenly Kelburn is back on par again with the Kapiti Coast, where it was before electronics turned up. The locals there are deluded about their claimed extra sunshine … BTW I think virtually all cases of initially missing Kelburn records were due to communication failures between Met & NIWA. However one day seemed to be lost in Jan 2014 (I didn't research it) - and during the earthquake event in July 2013 access to the Met. roof was banned for 3 days, so no readings for them - though estimates were done. The manual sites at Palmerston (Otago) and Winton have not produced credible data for years and there seems to be no point in retaining them.

[Nev]

… BTW I think virtually all cases of initially missing Kelburn records were due to communication failures between Met & NIWA. However one day seemed to be lost in Jan 2014 (I didn't research it) - and during the earthquake event in July 2013 access to the Met. roof was banned for 3 days, so no readings for them - though estimates were done.

Perhaps these incidents from NIWA's notes should also be added to that list: ...

• 19-Oct-2012 - Suncard blew away and could not be found. Daily estimate for sunshine based on hourly radiation values.

• 19-Jun-2010 - Suncard found partly out of recorder, possible affected by wind. Daily total entered but not hourly values.

• 15-Jul-1987 - Inspection of sunshine recorder. Card was found to be very loose fitting and liable to moved in strong winds. Recorder in generally weathered condition. Replacement recommended.

[RWood]

… BTW I think virtually all cases of initially missing Kelburn records were due to communication failures between Met & NIWA. However one day seemed to be lost in Jan 2014 (I didn't research it) - and during the earthquake event in July 2013 access to the Met. roof was banned for 3 days, so no readings for them - though estimates were done.

Perhaps these incidents from NIWA's notes should also be added to that list: ...

• 19-Oct-2012 - Suncard blew away and could not be found. Daily estimate for sunshine based on hourly radiation values.

• 19-Jun-2010 - Suncard found partly out of recorder, possible affected by wind. Daily total entered but not hourly values.

• 15-Jul-1987 - Inspection of sunshine recorder. Card was found to be very loose fitting and liable to moved in strong winds. Recorder in generally weathered condition. Replacement recommended.

Interesting, thanks. I looked at the other notes - nothing to indicate an explanation for the substantial (and slightly suspicious) drop in sun totals from decade 2000-2009 to 2010-2018. The issue will probably be academic now given the arrival of electronic measurement - I expect the manual readings will be phased out soon (though at Paraparaumu Aero and Invercargill Aero there has been a long period of overlap).