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Re: General July Weather
Posted: Wed 01/08/2018 11:42
by David
Howick - Stats from my station for July 2018:
Mean temp 10.5C
Mean daily max 15.0C
Mean daily min 6.4C
Highest temp 17.5C (26th)
Lowest temp 0.6C (4th)
Total rainfall 140.6mm
YTD rainfall 1122mm
Re: General July Weather
Posted: Wed 01/08/2018 13:51
by Bradley
Looks like Christchurch (botanical gardens site) has just recorded its warmest ever July maximums since records began in 1864 with an average max of 14.0C
Re: General July Weather
Posted: Wed 01/08/2018 14:32
by TonyT
Bradley wrote: ↑Wed 01/08/2018 13:51
Looks like Christchurch (botanical gardens site) has just recorded its warmest ever July maximums since records began in 1864 with an average max of 14.0C
Gardens data isn't usually filed till about 10 days into the next month. More likely its Niwa's contaminated Riccarton data invalidly being compared with the Gardens long term record.
Re: General July Weather
Posted: Wed 01/08/2018 15:04
by Nev
^ Christchurch Gardens comment was from MetService posted on Facebook…
Re: General July Weather
Posted: Wed 01/08/2018 15:04
by Nev
MetService July 2018 Summary
Frequent and unsettled northwesterlies prevailed across the South Island during July, resulting in above average rainfall for western areas of the South Island, but drier than usual conditions along the east coast. For the North Island, a mixture of prevailing westerlies and a ridge of high pressure produced well below normal rainfall for Gisborne, Hawkes Bay and the Wairarapa. In these regions, July rainfall totals ranked in the lowest handful (typically the 4th-6th driest July in the records). It was also relatively dry for Northland and the Bay of Plenty. Rainfall was close to normal elsewhere, with the exception of Kapiti, Horowhenua and Manawatu, where it was wetter than normal.
July temperatures were well above average across most of the South Island, as well as for the lower North Island. Elsewhere, monthly temperatures were closer to average.
Jul 2018 Climate Anomaly Maps ℅ NIWA.gif
Some very preliminary July 2018 figures for the main centres:
Code: Select all
July 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 14.7 +0.2 6.5 -0.8 10.6 -0.3 99 72% 144 110%
Auckland Aero 15.3 +1.0 7.4 -0.1 11.3 +0.4 124 93%
Tauranga Aero 15.1 +0.6 6.4 +0.3 10.7 +0.4 93 73% n/a n/a
Hamilton Aero 14.2 +0.4 3.8 +0.2 9.0 +0.3 133 103%
Hamilton, Ruakura 15.5 +1.7 3.4 -0.6 9.5 +0.6 116 99% 133 105%
Wellington, Kelburn 12.6 +1.2 7.8 +1.5 10.2 +1.3 128 93% 110 92%
Christchurch Aero 13.5 +2.6 1.1 +0.5 7.3 +1.5 24 37% 156 123%
Dunedin, Musselburgh 12.0 +2.0 3.7 +0.6 7.8 +1.3 30 52% 117 106%
Greymouth Aero 11.6 -0.5 5.6 +1.5 8.6 +0.5 301 152% 82 77%
Re: General July Weather
Posted: Wed 01/08/2018 16:34
by melja
Have to say this month really did go against a lot of predictions from some people round here.
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Re: General July Weather
Posted: Wed 01/08/2018 16:35
by Razor
Nev wrote: ↑Wed 01/08/2018 15:04
^ Christchurch Gardens comment was from MetService posted on Facebook…
I was talking with the staff who look after the site in the gardens...this is 'unofficially' true
Re: General July Weather
Posted: Wed 01/08/2018 17:37
by NZ Thunderstorm Soc
Only got 13.8mm of rain here for July and I think Levels got less than that.
Re: General July Weather
Posted: Wed 01/08/2018 18:05
by TonyT
melja wrote: ↑Wed 01/08/2018 16:34
Have to say this month really did go against a lot of predictions from some people round here.
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I'm happy to put my hand up. Medium range data (and my interpretation of it) was well off the mark this month. I interpreted the forecast anomalies to mean more easterly airflow (and therefore less sunshine, and therefore cooler temperatures). Instead we got westerly flows, which were for the most part weaker than we often see (so an easterly anomaly was correct), but westerly nonetheless, so sunshine hours were up and temperatures also. I guess the one thing I did see correctly was weak or non-existent southerly airflows, and I did say at the end of June that we had probably seen the coldest part of the winter then. Like I said in an earlier comment, the atmosphere is smoking some strange backy at the moment and there are puzzling outcomes on both short term (day to day forecasting) and longer term (seasonal trends) time scales. El Nino looking less likely now, as SST anomalies in the Nino zones have dropped back closer to zero this week. No sunspots for 23 days, and 33 of the last 34 spotless. We live in interesting times.
Re: General July Weather
Posted: Wed 01/08/2018 18:38
by melja
I wasn't going to name names Tony but I do follow your comments very closely on here and FB and noticed it haha
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Re: General July Weather
Posted: Thu 02/08/2018 12:31
by RWood
I see Metservice are stating that Christchurch Gardens had an average July Tmax of 14.0C, its highest in a very long record. Napier did pretty well for sun - even with the usual caveats on sunshine measurement, 199 hours is a very good tally for a NZ location (though Blenheim reported a remarkable 231 hours in July 1952).
Oops - didn't note the earlier discussion. Will see how up to date the Gardens daily max/min data is on CliFlo.
Edit - nothing beyond July 1 there yet. If Gardens were about 0.4C higher than the Aero as a first guess that would give a result of about 13.7C - let's see.
Re: General July Weather
Posted: Thu 02/08/2018 15:19
by Nev
^ I've amended the mean T-maxs I had for Wgtn and Chch in the table above.
So it looks like Chch Aero's 13.5C was its equal-highest (with 2013), Musselburgh's 12.0C its 2nd equal highest (after 2013), Akld Aero's 15.3C its 3rd equal-highest, and both Ruakura's 15.5C and Kelburn's 12.6C their 4th highest.
Re: General July Weather
Posted: Thu 02/08/2018 15:49
by RWood
Nev wrote: ↑Thu 02/08/2018 15:19
^ I've amended the mean T-maxs I had for Wgtn and Chch in the table above.
So it looks like Chch Aero's 13.5C was its equal-highest (with 2013), Musselburgh's 12.0C its 2nd equal-highest (after 2013), Akld Aero's 15.3C its 3rd equal-highest, and both Ruakura's 15.5C and Kelburn's 12.6C their 4th highest.
Then if one adds 0.4C to the Chch Aero mean (a guess based on the difference between the 30-year means) then a fortuitous rounding could give the Gardens its 14.0C mean.
Re: General July Weather
Posted: Fri 03/08/2018 16:34
by Nev
Here's NIWA's preliminary, '
July 2018 National Climate Summary'.
July 2018 was NZ's 5th-warmest July on record (behind 1998, 2000, 2005, and 2013).
The national average temp of 8.9C was 1.1C above normal.
The month's highest temp of 22.3C was recorded at Kaikoura on the 21st, while the lowest temp of -7.6C was recorded at Middlemarch on the 13th.
Lots of near-record high temps (and no record low temps), including Dunedin's 2nd highest July mean-temp and Wellington's 3rd highest.
Note that NIWA's Mangere temps used for Auckland look suspiciously way too low, especially when compared to nearby sites like Auckland Aero.
Re: General July Weather
Posted: Mon 06/08/2018 12:27
by tunster
TonyT wrote: ↑Wed 01/08/2018 18:05
Instead we got westerly flows,
which were for the most part weaker than we often see (so an easterly anomaly was correct), but westerly nonetheless,
Actual anomalies for July show a westerly anomaly at 1000hPa and 500hPa, not an easterly anomaly.
Re: General July Weather
Posted: Mon 06/08/2018 13:05
by TonyT
tunster wrote: ↑Mon 06/08/2018 12:27
TonyT wrote: ↑Wed 01/08/2018 18:05
Instead we got westerly flows,
which were for the most part weaker than we often see (so an easterly anomaly was correct), but westerly nonetheless,
Actual anomalies for July show a westerly anomaly at 1000hPa and 500hPa, not an easterly anomaly.
Ah well, more busted than Joseph Parker then.