28-50 years
Heavy rain closed roads across the North Island due to flooding, slips and washouts.
The Rotorua-Taupo road was closed.
The Wairoa-Te Whaiti Road and the Desert Road was closed.
Trains between Paeroa and Tauranga were cancelled on the 7th. Heavy rains brought down both sides of a deep cutting near Tauranga on to the line.
The worst fog of the year blanketed Auckland and the bulk of the West Coast from Auckland to New Plymouth for the greater part of the morning of the 5th. Fog was also thick in Marlborough Sounds.
The East Coast state highway from Mangonui was flooded on the morning of the 4th.
Some flooding occurred in Kaitaia.
Visibility was limited to 200 yards due to fog on the morning of the 5th and no aircrafts were able to take of until 10am. Some flights were cancelled and others were delayed.
Strong winds and rain swept the Auckland province on the 4th. There were no reports of damage and only isolated flooding occurred.
Wind averaged 30 mph (48 km/hr) for most of the day on the 4th but two gusts of wind over 50 mph (80 km/hr) were reported at Mechanics Bay.
Waikato River rose 4 ft 6 in (1.37 m) above normal in Hamilton on the 6th.
The upper coffer dam at the Maraetai hydro-electric power site burst on the morning of the 6th under the weight of the flood swollen Waikato River, endangering the half-completed main dam and the power house which stands behind it. The Waikato River rose 25 ft (7.62 m) to burst the coffer dam which was built to divert the river into the diversion tunnel and allow the dam site to be pumped free of water. The water stopped rising however and the main construction was saved from serious damage. It was estimated to be a one in 50 year flood.
The river was swollen to between two and a half and three times its normal flow.
Taupo recorded 3.25 in (8.26 cm) of rain from 12pm on the 4th to 4pm on the 5th.
Taupo recorded 5.5 in (13.97 cm) of rain from the 4th to the 6th.
Local pumice roads were in a deplorable state and many cars had to be towed out of trouble on the National Park, Napier, Atiamuri and Rotorua roads.
Waihi recorded 5.38 in (13.67 cm) of rain in 24 hours.
There was heavy rain and a strong north easterly wind on the 5th of July 1951.
There was flooding and road damage reported throughout parts of the district. There was much surface water on the Rangitaiki Plains.
Road communications throughout the Bay of Plenty was disrupted. Several state and main highways were impassable.
The State hydro-electric power line between Edgecumbe and Te Puke cut out on the night of the 5th. Consumers in the area between Gate Pa and Otamarakau, including Mount Maunganui were without electric power.
The damage to county roads amounted to £11,155 ($603,400 2010 dollars).
The damage to main highways amounted to £11,357 ($614,300 2010 dollars).
Edgecumbe recorded 3.78 in (9.60 cm) of rain in 24 hours on the 4th.
Edgecumbe recorded 3.17 in (8.05 cm) of rain in 24 hours on the 5th.
Rangitaiki River had a peak discharge of 11,300 cusecs (320 cumecs) at Edgecumbe.
Kaingaroa recorded 2.84 in (7.21 cm) of rain in 24 hours on the 4th.
Kaingaroa recorded 3.50 in (8.89 cm) of rain in 24 hours on the 5th.
Kaituna River had a peak discharge of 4900 cusecs (139 cumecs) at the state highway bridge.
Washouts occurred on the roads.
Several houses in the low-lying areas were under several inches of water.
A few homes were evacuated on the night of the 5th and in at least three of them the water rose above the floor level.
Rotorua recorded 3.68 in (9.35 cm) of rain in 24 hours on the 4th.
Rotorua recorded 3.31 in (8.41 cm) of rain in 24 hours on the 5th.
Rotorua recorded almost 5 in (12.7 cm) of rain between 9am on the 4th to 3pm on the 5th.
Whakarewarewa recorded 3.66 in (9.30 cm) of rain in 24 hours on the 4th.
Whakarewarewa recorded 3.15 in (8.00 cm) of rain in 24 hours on the 5th.
Homes were inundated in the Rotorua district and out building were washed away in the highest flood for 28 years.
Railway lines were blocked by flood waters and slips. Train services between Rotorua and Frankton Junction were cancelled on the 6th.
On the main highway to Auckland, about 15 miles from Rotorua, water was up to 2 ft (0.61 m) deep.
The aerodrome was partially flooded and all flights were cancelled.
Two of Rotorua's scenic attractions suffered severe damage. Paradise Valley and Ataahua was closed. Flood waters washed away bridges in Paradise Valley and a pool of carp was lost. Sixteen foot bridges in the Ataahua Canyon were destroyed by the flood waters. The damage was estimated at over £1000 ($54,100 2010 dollars).
Tauranga recorded 6.41 in (16.28 cm) of rain in 24 hours.
Tauranga recorded over 9 in (22.86 cm) of rain in 48 hours.
Practically every country road suffered minor slips and severe washouts.
The Tauranga-Mount Maunganui highway was impassable due to slips. Minor slips occurred near Hairini and a big slip at the seven mile hill from Tauranga.
In parts of the business areas footpaths were under water and some shops and business premises were flooded.
The rainfall in Te Puke was reported to be the heaviest in the district for 25 years.
Te Puke recorded over 8 in (20.32 cm) of rain in 24 hours.
Rivers flooded over the roads in several places in the Te Puke district. All roads were in bad condition and the Rotorua-Tauranga main route via Te Puke was closed.
There were serious stock losses in the Te Puke area. One farmer lost about 150 wethers.
The approaches to a railway bridge between Te Puke and Rangiuru were washed away.
Te Puke was without power for 18 hours on the 6th due to flooding.
Two families were taken by boat from their homes which were threatened by the floods.
Te Ranga recorded 8.82 in (22.40 cm) of rain in 24 hours on the 4th.
Te Ranga recorded 7.69 in (19.53 cm) of rain in 24 hours on the 5th.
Winds reaching gale force accompained by driving rain swept the Whakatane district and the Rangitaiki Plains on the 4th and the 5th..
There was minor flooding reported.
All highways leading to Whakatane were blocked.
The main road south of Taumarunui to National Park was in very bad condition.
28-50 years
Heavy rain closed roads across the North Island due to flooding, slips and washouts.
The Rotorua-Taupo road was closed.
The Wairoa-Te Whaiti Road and the Desert Road was closed.
Trains between Paeroa and Tauranga were cancelled on the 7th. Heavy rains brought down both sides of a deep cutting near Tauranga on to the line.
The worst fog of the year blanketed Auckland and the bulk of the West Coast from Auckland to New Plymouth for the greater part of the morning of the 5th. Fog was also thick in Marlborough Sounds.
The East Coast state highway from Mangonui was flooded on the morning of the 4th.
Some flooding occurred in Kaitaia.
Visibility was limited to 200 yards due to fog on the morning of the 5th and no aircrafts were able to take of until 10am. Some flights were cancelled and others were delayed.
Strong winds and rain swept the Auckland province on the 4th. There were no reports of damage and only isolated flooding occurred.
Wind averaged 30 mph (48 km/hr) for most of the day on the 4th but two gusts of wind over 50 mph (80 km/hr) were reported at Mechanics Bay.
Waikato River rose 4 ft 6 in (1.37 m) above normal in Hamilton on the 6th.
The upper coffer dam at the Maraetai hydro-electric power site burst on the morning of the 6th under the weight of the flood swollen Waikato River, endangering the half-completed main dam and the power house which stands behind it. The Waikato River rose 25 ft (7.62 m) to burst the coffer dam which was built to divert the river into the diversion tunnel and allow the dam site to be pumped free of water. The water stopped rising however and the main construction was saved from serious damage. It was estimated to be a one in 50 year flood.
The river was swollen to between two and a half and three times its normal flow.
Taupo recorded 3.25 in (8.26 cm) of rain from 12pm on the 4th to 4pm on the 5th.
Taupo recorded 5.5 in (13.97 cm) of rain from the 4th to the 6th.
Local pumice roads were in a deplorable state and many cars had to be towed out of trouble on the National Park, Napier, Atiamuri and Rotorua roads.
Waihi recorded 5.38 in (13.67 cm) of rain in 24 hours.
There was heavy rain and a strong north easterly wind on the 5th of July 1951.
There was flooding and road damage reported throughout parts of the district. There was much surface water on the Rangitaiki Plains.
Road communications throughout the Bay of Plenty was disrupted. Several state and main highways were impassable.
The State hydro-electric power line between Edgecumbe and Te Puke cut out on the night of the 5th. Consumers in the area between Gate Pa and Otamarakau, including Mount Maunganui were without electric power.
The damage to county roads amounted to £11,155 ($603,400 2010 dollars).
The damage to main highways amounted to £11,357 ($614,300 2010 dollars).
Edgecumbe recorded 3.78 in (9.60 cm) of rain in 24 hours on the 4th.
Edgecumbe recorded 3.17 in (8.05 cm) of rain in 24 hours on the 5th.
Rangitaiki River had a peak discharge of 11,300 cusecs (320 cumecs) at Edgecumbe.
Kaingaroa recorded 2.84 in (7.21 cm) of rain in 24 hours on the 4th.
Kaingaroa recorded 3.50 in (8.89 cm) of rain in 24 hours on the 5th.
Kaituna River had a peak discharge of 4900 cusecs (139 cumecs) at the state highway bridge.
Washouts occurred on the roads.
Several houses in the low-lying areas were under several inches of water.
A few homes were evacuated on the night of the 5th and in at least three of them the water rose above the floor level.
Rotorua recorded 3.68 in (9.35 cm) of rain in 24 hours on the 4th.
Rotorua recorded 3.31 in (8.41 cm) of rain in 24 hours on the 5th.
Rotorua recorded almost 5 in (12.7 cm) of rain between 9am on the 4th to 3pm on the 5th.
Whakarewarewa recorded 3.66 in (9.30 cm) of rain in 24 hours on the 4th.
Whakarewarewa recorded 3.15 in (8.00 cm) of rain in 24 hours on the 5th.
Homes were inundated in the Rotorua district and out building were washed away in the highest flood for 28 years.
Railway lines were blocked by flood waters and slips. Train services between Rotorua and Frankton Junction were cancelled on the 6th.
On the main highway to Auckland, about 15 miles from Rotorua, water was up to 2 ft (0.61 m) deep.
The aerodrome was partially flooded and all flights were cancelled.
Two of Rotorua's scenic attractions suffered severe damage. Paradise Valley and Ataahua was closed. Flood waters washed away bridges in Paradise Valley and a pool of carp was lost. Sixteen foot bridges in the Ataahua Canyon were destroyed by the flood waters. The damage was estimated at over £1000 ($54,100 2010 dollars).
Tauranga recorded 6.41 in (16.28 cm) of rain in 24 hours.
Tauranga recorded over 9 in (22.86 cm) of rain in 48 hours.
Practically every country road suffered minor slips and severe washouts.
The Tauranga-Mount Maunganui highway was impassable due to slips. Minor slips occurred near Hairini and a big slip at the seven mile hill from Tauranga.
In parts of the business areas footpaths were under water and some shops and business premises were flooded.
The rainfall in Te Puke was reported to be the heaviest in the district for 25 years.
Te Puke recorded over 8 in (20.32 cm) of rain in 24 hours.
Rivers flooded over the roads in several places in the Te Puke district. All roads were in bad condition and the Rotorua-Tauranga main route via Te Puke was closed.
There were serious stock losses in the Te Puke area. One farmer lost about 150 wethers.
The approaches to a railway bridge between Te Puke and Rangiuru were washed away.
Te Puke was without power for 18 hours on the 6th due to flooding.
Two families were taken by boat from their homes which were threatened by the floods.
Te Ranga recorded 8.82 in (22.40 cm) of rain in 24 hours on the 4th.
Te Ranga recorded 7.69 in (19.53 cm) of rain in 24 hours on the 5th.
Winds reaching gale force accompained by driving rain swept the Whakatane district and the Rangitaiki Plains on the 4th and the 5th..
There was minor flooding reported.
All highways leading to Whakatane were blocked.
The main road south of Taumarunui to National Park was in very bad condition.