General June Weather

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tich
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Re: General June Weather

Unread post by tich »

spwill wrote:Looks like June temps were near average for NZ but on the warm side of average
North Island probably, but hard to believe for South Island, especially inland.
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Re: General June Weather

Unread post by spwill »

tich wrote:
spwill wrote:Looks like June temps were near average for NZ but on the warm side of average
North Island probably, but hard to believe for South Island, especially inland.
I used the Niwa climate maps as a rough guide.
https://www.niwa.co.nz/static/climate/m ... p.png?1234
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Re: General June Weather

Unread post by Nev »

June 2015 was another month of two halves. Exceptionally warm temps in the first half, particularly in the central-south of the S.I. and central areas of the N.I., were countered by a snowstorm and near-record cold temps in the south during the second half.
Early in the month, a few good thunderstorms occurred in the western north of the N.I., while near-record rainfall and flooding occurred in Dunedin. And later in the month more extreme rainfall lead to severe flooding in the West Coast and the Taranaki/Manawatu-Wanganui area.
Apart from central NZ and Southland, sunshine was fairly well above average.
june 2015 Climate Anomaly Map ℅ NIWA.gif
Some very preliminary June 2015 figures for the main centres:

Code: Select all

June 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        16.1  +0.8      9.6  +1.2     12.8  +1.0      73   61% 
Auckland Aero            15.4  +0.2      9.4  +1.0     12.4  +0.6      89   83% 
Tauranga Aero            15.4  +0.3      7.9  +1.0     11.6  +0.6      35   31%
Hamilton Aero            14.6  +0.4      5.5  +1.0     10.1  +0.7      68   54% 
Hamilton, Ruakura        15.2  +0.9      6.3  +1.5     10.8  +1.2      63   54% 
Wellington, Kelburn      12.7  +0.5      6.9  -0.3      9.8  +0.1     150  109% 
Christchurch Aero        13.0  +1.3      0.5  -0.6      6.7  +0.3      80  139% 
Dunedin, Musselburgh     11.3  +0.7      3.1  -0.9      7.2  -0.1     194  335%
Greymouth Aero           12.0  -0.5      5.7  +0.6      8.9  -0.1     325  136%
Below are also some of the more notable rainfalls this month…

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June 2015 Rainfall (mm)     mth  ±norm     2-day  date    24-hr   date
  
Dunedin City                239             179  03-04     175  04 >0400
Dunedin, Musselburgh        194   335%      144  03-04     142  04 >0400
Dunedin Aero                158   335%      107  03-04     104  03 >0000

Franz Josef                 724   161%      395  18-19     366  19 >0400
Hokitika Aero               406   152%      249  18-19     184  18 >0900 
Greymouth Aero              325   136%      185  18-19     153  19 >0600
Westport Aero               243   106%       83  18-19      74  18 >0900

Mt Ruapehu, Chateau         451   175%      165  19-20     113  20 >1900
Stratford                   339   173%      229  19-20     144  20 >0600
Palmerston North Aero       274   298%      163  19-20     133  20 >0000 
Wanganui, Spriggens Park    236   259%      144  19-20     116  20 >2200
New Plymouth Aero           212   143%      131  19-20      96  20 >0000
Hawera                      211   177%       95  19-20      57  20 >0000
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RWood
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Re: General June Weather

Unread post by RWood »

tich wrote:
spwill wrote:Looks like June temps were near average for NZ but on the warm side of average
North Island probably, but hard to believe for South Island, especially inland.
I knew someone would say that - cold spell removed recollection of the warm part for many
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Re: General June Weather

Unread post by TonyT »

The difference is, the warm maximums early in the month were often only a few hours in the afternoons, and the rest of the day was cool. However, the cold maximums later on were reflecting most of the 24 hour period, and of course the long run of frosts at night was highly significant but has got lost in the month-long statistics. Most people would consider June a cold month, in terms of what they experienced most of the time.
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Re: General June Weather

Unread post by RWood »

TonyT wrote:The difference is, the warm maximums early in the month were often only a few hours in the afternoons, and the rest of the day was cool. However, the cold maximums later on were reflecting most of the 24 hour period, and of course the long run of frosts at night was highly significant but has got lost in the month-long statistics. Most people would consider June a cold month, in terms of what they experienced most of the time.
Which brings up the old question of using more data points to determine daily Tmean values. I suspect there is a bigger issue there for Cantabrians than for many parts of NZ. If data is available (say hourly or 3-hourly) it would be interesting to see how well monthly means calculated by 0.5(Tmax+Tmin) methods correlated with the alternative series - say for Ch'ch Aero or Gardens. Locally I don't think the 0.1+ flattered the city at all as the Tmax values were above average and there were more sunny days than usual. For me, the winter months here that feel "colder" are the duller cloudier ones which typically have relatively mild nights.
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Re: General June Weather

Unread post by NZstorm »

June felt mild in Auckland this year.
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Re: General June Weather

Unread post by Nev »

Rainfall, temp and sunshine anomaly maps showing first and last half of June 2015…
June 2015 Climate Anomaly Maps in 2 halves ℅ NIWA.gif
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Re: General June Weather

Unread post by Manukau heads obs »

was a bit above average here too..and that's with 1 minute data for the average
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Re: General June Weather

Unread post by spwill »

its been a good winter in Auckland so far however I prefer the wetter version of our Winter for the weather interest.

I think for Auckland calculating the mean temp from the min /max works okay because temperatures are quite steady, no sharp rises/falls.
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Re: General June Weather

Unread post by Nev »

Here's NIWA's preliminary, 'June 2015 National Climate Summary'.

Very wet in many parts and an extremely cold snap for the south.


The national average temp of 8.9C was 0.4C above normal.

The month's highest temp of 21.7C was recorded at Cheviot on the 1st, and the lowest of -21.0C was recorded at Tara Hills on the 24th.
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Re: General June Weather

Unread post by Razor »

Nev wrote:Here's NIWA's preliminary, 'June 2015 National Climate Summary'.

Very wet in many parts and an extremely cold snap for the south.


The national average temp of 8.9C was 0.4C above normal.

The month's highest temp of 21.7C was recorded at Cheviot on the 1st, and the lowest of -21.0C was recorded at Tara Hills on the 24th.
Nooooooo....they quoted a "mini tornado..... :-#
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Re: General June Weather

Unread post by RWood »

Nev wrote:Here's NIWA's preliminary, 'June 2015 National Climate Summary'.

Very wet in many parts and an extremely cold snap for the south.


The national average temp of 8.9C was 0.4C above normal.

The month's highest temp of 21.7C was recorded at Cheviot on the 1st, and the lowest of -21.0C was recorded at Tara Hills on the 24th.
2 high 24-hour values are quoted for Hokitika sites, one of them (211mm) claiming to be a record. The Hokitika South site (I think that was the name) surpassed this at least twice - with 9.17" (233mm) in February 1935 and 8.58" (219mm) in January 1958. Since they cite periods going back to 1866, these should have been considered it seems.

Quite a good month for Wellington City with more W/SW flows and a useful sunshine surplus plus a slight positive anomaly for the average Tmax. A vastly better June than the dismal ones of 2010,2011 and 2013.
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