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One of Dunedin's most memorable snow events, the "Great Snow of 1939" brought the city to a shivering and prolonged halt. On the 80th anniversary of the polar blast, these photographs illustrate just how much snow there was. 

Abandoned cars resembled igloos, 5m snow drifts blocked doorways and children sledged and skied down Dunedin’s main streets.

It’s hard to comprehend the quantity of snow that fell in July 1939, particularly when Dunedin appears to have had one of its warmest and driest Julys on record.

Eighty years later, on the anniversary of the polar dumping, residents are still talking about the ‘‘Great Snow of 1939’’, which left much of New Zealand covered in a giant white blanket.

Niwa records show the severe snowstorm started in Dunedin on July 24, 1939, and lasted several days.

Because of the amount of snow that fell in that time, it was considered a once-in-500-year event.

It was one of many snowstorms to hit the region between June and August 1939, caused by frequent southerly outbreaks, and to this day the winter of 1939 is regarded as the worst for snow in living memory.

On July 24, a Monday, there was a sudden change in wind direction and a drop in temperature just before noon, followed by several heavy sleet showers and falls of snow during the afternoon and evening.

Snowfalls continued on July 25 and became heavier and more frequent later in the afternoon.

About 50cm fell in the city centre and up to a metre fell in the hill suburbs, leaving some areas with snowdrifts up to 5m deep.

The weight of the snow caused many roofs and skylights around the city to cave in.

It also had serious effects on transport services. Transport was completely chaotic on July 25 and cars were held up everywhere, some in deep drifts.

Snow halted many of the tram services from the morning of July 25 until noon on July 28.

The snow and ice closed roads in and out of Dunedin, meaning supplies could not be delivered to the city, and difficulties travelling around the city meant a large number of residents had to go without food, coal and wood.

Some families were forced to replenish their wood, coal and food supplies by pulling sledges through the snow.

Port Chalmers was blocked off, and in an extraordinary bid to deliver the daily newspapers, copies were sent by launch down the harbour.

Further south, falls of up to 2m and drifts of about 6m were reported along the road from Outram to Middlemarch and in places between Gore and Balclutha.

Huge snowdrifts were also reported to have blocked the railway line between Kingston and Garston, and in some places along the railway line, snow was up to the carriage windows of the train.

In Southland, the great snowfall began on July 22 and did not let up for six days. It fell on ground that was already iron-hard from frosts.

The frigid temperatures turned household water supplies and stock troughs into solid ice.

Stock losses were huge, the main contributing factor being the length of time the snow lay on the ground.

After the snow cleared, sheep carcasses buried for six weeks were found flattened and preserved.

Much of New Zealand was affected by the snowstorms, including the winterless north.

On July 31, 1939, snow was reported by the lighthouse keeper at Cape Maria van Diemen at the top of the North Island; and in Auckland, snow fell in many suburbs just before dawn on July 27.