General July Weather

[NZ Thunderstorm Soc]

After a frosty start, a fine day eventuated with a maximum temperature of 16.5C.
Nice much wind, if so a light north to NW.

[Razor]

Nice sunset to end July. Wind is coming

[Nev]

July 2023 was another exceptionally warm month overall. It was also much drier than previous months for most parts, except for the east and south of the South Island, which included some flooding in Canterbury. The odd heavy rainfall event also caused more slips in the Coromandel Peninsula and Gisborne/Tairāwhiti.

Jul 2023 Climate Anomaly Maps ℅ NIWA.png

Preliminary stats for the main centres:

Code: Select all

July 2023 Average Temps, Rainfall, Sunshine and departures from 1991-2020 normals ℅ NIWA

Site                     T-max °C      T-min °C      T-mean °C     Rain mm      Sun hrs

Auckland, Mangere       15.5  +0.8     9.2  +1.7    12.4  +1.3    104   75%    137  102%
Tauranga Aero *         15.7  +1.1     8.1  +1.8    11.9  +1.4     79   59%
Hamilton Aero *         14.6  +0.8     5.5  +1.5    10.1  +1.2     47   34%    129  101%
Wellington, Kelburn     12.7  +1.0     6.5  -0.2     9.6  +0.4    114   77%    126  104%
Christchurch Aero       12.3  +1.1     0.8  +0.1     6.6  +0.6    155  241%    150  117%
Dunedin, Musselburgh    11.6  +1.2     5.4  +2.4     8.5  +1.8     79  153%     93   80%
Greymouth Aero          13.4  +1.1     5.3  +1.0     9.4  +1.1     97   49%    117  103%

* Tauranga missing 4 days of rainfall data. * Hamilton sunshine from Ruakura. 

Dunedin recorded its warmest July average T-min and T-mean from records since 1947.

Edit: Amended Wgtn rainfall percentage.

[NZ Thunderstorm Soc]

July's readings for Raukapuka/Geraldine.

Max Temp - 18.5C (Wednesday the 19th)
Min Temp - minus 3.1C (Friday the 7th)
Lowest Max - 8.8C (Friday the 7th)
Highest Min - 8.1C (Monday the 24th)
Total rainfall was 170mm over 8 days with 120 mm falling on Sunday the 23rd.
12 frosts were recorded.
Interesting to note that Timaru airport only recorded 96.4mm for the month and Fairlie 80.4mm from MetService.

[BeaconHill]

I think the Wellington rainfall figure of 114 being 36% of average is a typo?
MetService site says July average for Kelburn is 132.7, vs them also reporting 114 for July.
So percentage figure should be 86%.

Wellington_July_Rain.png

July 2023 was another exceptionally warm month overall. It was also much drier than previous months for most parts, except for the east and south of the South Island, which included some flooding in Canterbury. The odd heavy rainfall event also caused more slips in the Coromandel Peninsula and Gisborne/Tairāwhiti.


Jul 2023 Climate Anomaly Maps ℅ NIWA.png


Preliminary stats for the main centres:

Code: Select all

July 2023 Average Temps, Rainfall, Sunshine and departures from 1991-2020 normals ℅ NIWA

Site                     T-max °C      T-min °C      T-mean °C     Rain mm      Sun hrs

Auckland, Mangere       15.5  +0.8     9.2  +1.7    12.4  +1.3    104   75%    137  102%
Tauranga Aero *         15.7  +1.1     8.1  +1.8    11.9  +1.4     79   59%
Hamilton Aero *         14.6  +0.8     5.5  +1.5    10.1  +1.2     47   34%    129  101%
Wellington, Kelburn     12.6  +0.9     6.5  -0.2     9.6  +0.4    114   36%    126  104%
Christchurch Aero       12.3  +1.1     0.8  +0.1     6.6  +0.6    155  241%    150  117%
Dunedin, Musselburgh    11.6  +1.2     5.4  +2.4     8.5  +1.8     79  153%     93   80%
Greymouth Aero          13.4  +1.1     5.3  +1.0     9.4  +1.1     97   49%    117  103%

* Tauranga missing 4 days of rainfall data. * Hamilton sunshine from Ruakura. 

Dunedin recorded its warmest July average T-min and T-mean from records since 1947.

[Nev]

I think the Wellington rainfall figure of 114 being 36% of average is a typo?
MetService site says July average for Kelburn is 132.7, vs them also reporting 114 for July.
So percentage figure should be 86%.

Wellington_July_Rain.png

Thanks BeaconHill. Yes, it was a typo. Have amended my original post.
Wellington's 114.0mm last month should be 77% of its 147.1mm 1991-2020 normal.
Note that MS's 1981-2010 normal of 132.7mm should be 137.2mm.

[Nev]

According to NIWA, July 2023 was NZ's 4th warmest July on record, following our 5th warmest June on record. It was also NZ's 2nd warmest June-July period on record after 2021. What are the odds of this winter ending up our warmest on record for the 4th consecutive year?