August Summary, 2009

[Tornado Tim]

Post your summary of temperatures and trends here:
Here a extract from Matangi's Summary Here:

Average temperature = 11.3°C
Average humidity = 87%
Average dewpoint = 9.0°C
Average barometer = 1019.0 mb
Average windspeed = 6.0 km/h
Average gustspeed = 9.2 km/h
Average direction = 59° (ENE)
Rainfall for month = 130.0 mm
Rainfall for year = 799.2 mm
Maximum rain per minute = 1.8 mm on day 19 at time 00:03
Maximum temperature = 19.5°C on day 29 at time 12:26
Minimum temperature = 0.3°C on day 07 at time 07:29
Maximum humidity = 100% on day 29 at time 09:20
Minimum humidity = 54% on day 08 at time 15:35
Maximum pressure = 1034.5 mb on day 11 at time 08:33
Minimum pressure = 997.3 mb on day 31 at time 02:15
Maximum windspeed = 37.0 kmh from 023°(NNE) on day 30 at time 23:06
Maximum gust speed = 51.8 km/h from 023°(NNE) on day 31 at time 00:49
Maximum heat index = 25.8°C on day 28 at time 15:42

View the Full Doc here: http://wx-matangi.dyndns.org/current_We ... st2009.htm

OR

http://wx-matangi.dyndns.org/current_We ... report.htm

[GraemeWi]

August 2009 Summary
Henderson, Auckland. S36.86962 E174.62065 41m ASL
Maxiumum Temperature: 21.5° Sunday 30-August-09
Lowest Maximum: 15.0° Wednesday 05-August-09
Minimum Temperature: 2.5° Friday 07-August-09
Highest Minimum: 14.3° Saturday 15-August-09
Total Rainfall: 91.4 mm
Days with Rain: 16 out of 31 days
Most Rain: 15.0 mm Monday 31-August-09
Highest Pressure: 1031.2 mb Tuesday 11-August-09
Lowest Pressure: 997.0 mb Monday 31-August-09

aug09.gif

[David]

Here's an article from NZ Herald
Hottest August on record

[Manukau heads obs]

maybe you could argue that eventualy you would get a august where there was alot of warm winds (NE or NW) and no cold southerly outbreaks, for the whole month....
or is it because of climate change, where we seem to get stuck weather patterns more now? (seems that is what has been happening in the USA alot lately too (i.e stuck or slow moving jet stream set ups))

[Nev]

Here's NIWA's preliminary August 2009 Climate Summary.

[David]

The highest temperature for the month being 25.5°C at Henderson sounds wrong....and it says it is not an Aug record
This sounds very familiar!!

[spwill]

Dunedin was warmer than Christchurch.

The highest 1 day rainfall total was at Awakina, Waitomo 260.4mm.

[RWood]

It also says that the Kelburn mean temp. was well above normal, but if fact it was a record high by a margin of at least 0.25C.

[RWood]

Dunedin was warmer than Christchurch.

The highest 1 day rainfall total was at Awakina, Waitomo 260.4mm.

I've pointed this out before - Ch'ch reading is from the Aero, significantly cooler than the city, while Dunedin's is from Musselburgh, which is warmer than the average Dunedin location on account of high night minima.

[Nev]

The highest temperature for the month being 25.5°C at Henderson sounds wrong....and it says it is not an Aug record
This sounds very familiar!!

Agreed. The other ARC site, just 0.75 km away, recorded 15.5°C that day, so a data input error?

[spwill]

I've pointed this out before - Ch'ch reading is from the Aero, significantly cooler than the city, while Dunedin's is from Musselburgh, which is warmer than the average Dunedin location on account of high night minima.

Thanks RWood, I thought the pattern this August would favour Chch more.

[Razor]

It has certainly seemed a much warmer than normal August. I called it spring right at the beginning of the month and it pretty much stayed that way the whole way through

[ricky]

August Summary for Grey Lynn http://greylynnweather.net/August2009.htm

Average temperature = 12.8°C
Average humidity = 85%
Average dewpoint = 10.2°C
Average barometer = 1018.2 hPa
Average windspeed = 9.2 km/h
Average gustspeed = 14.8 km/h
Average direction = 34° (NNE)
Rainfall for month = 72.8 mm
Rainfall for year = 539.4 mm
Maximum rain per minute = 1.2 mm on day 30 at time 12:54
Maximum temperature = 19.7°C on day 28 at time 12:19
Minimum temperature = 3.9°C on day 05 at time 04:45
Maximum humidity = 100% on day 28 at time 08:05
Minimum humidity = 54% on day 28 at time 13:33
Maximum pressure = 1032.6 hPa on day 11 at time 09:37
Minimum pressure = 998.6 hPa on day 30 at time 01:56
Maximum windspeed = 38.9 kmh from 293°(WNW) on day 30 at time 03:50
Maximum gust speed = 61.1 km/h from 293°(WNW) on day 30 at time 03:49
Maximum heat index = 25.4°C on day 26 at time 14:07
Max soil temperature= 16.3°C
Min soil temperature= 9.0°C
Avg daily max temp :16.5°C
Avg daily min temp :10.2°C

[RWood]

NIWA August stats are out:

http://www.niwa.co.nz/news-and-publicat ... msum-09-08

Look for the link at the bottom.

Too early to get data from the Cropp sites, but Ivory Glacier (Waitaha headwaters south of Ross) at 1390m recorded 2002mm, 513mm on 25th. I would expect the Cropp totals to be at least around the 2400mm mark.