New Zealand
Best time to ski in New Zealand: natural snow month by month
When natural snow has been most reliable at the 6 resorts Cirque models in New Zealand, month by month, from eleven winters of weather data.
Every resort Cirque models here
Each cell is one month: the share of days with 30 cm or more of modelled natural snow at mid-mountain over the last 11 winters, from brown (often thin) to deep blue (snow-sure). Blank means almost none.
The short answer
No month has been reliably snow-sure across New Zealand. The best odds have been in September, when 3 of the 6 resorts Cirque models here were snow-sure in at least 9 of the last 11 winters. Snowmaking matters a lot here.
Month by month
June: 0 of 6 snow-sure. Surest: Treble Cone (1 of 11), Coronet Peak (1 of 11) and Cardrona (1 of 11).
July: 0 of 6 snow-sure. Surest: Treble Cone (5 of 11), Cardrona (2 of 11) and Coronet Peak (2 of 11).
August: 2 of 6 snow-sure. Surest: Cardrona (10 of 11), Treble Cone (10 of 11) and The Remarkables (8 of 11).
September: 3 of 6 snow-sure. Surest: The Remarkables (11 of 11), Cardrona (11 of 11) and Treble Cone (10 of 11).
October: 1 of 6 snow-sure. Surest: Treble Cone (9 of 11), The Remarkables (7 of 11) and Cardrona (6 of 11).
November: 0 of 6 snow-sure. Surest: Treble Cone (6 of 11), Cardrona (0 of 11) and The Remarkables (0 of 11).
December: none snow-sure in any winter. Most natural snow at Treble Cone (14% of days).
Resort by resort
Cardrona, New Zealand, 1,670–1,860 m: snow-sure August to September.
Coronet Peak, New Zealand, 1,168–1,649 m: no month snow-sure in 9 of 11 winters. Best: August, hit and miss (6 of 11).
Mt Hutt, New Zealand, 1,406–2,086 m: no month snow-sure in 9 of 11 winters. Best: August, usually good (7 of 11).
The Remarkables, New Zealand, 1,586–1,943 m: snow-sure September.
Treble Cone, New Zealand, 1,200–1,860 m: snow-sure August to October.
Whakapapa (Mt Ruapehu), New Zealand, 1,630–2,300 m: no month snow-sure in 9 of 11 winters. Best: September, hit and miss (4 of 11).
Questions
When is the best time to ski in New Zealand?
For natural snow, September. That is when the most resorts Cirque models in New Zealand have been snow-sure over the last 11 winters.
When does natural snow become reliable in New Zealand?
The first month in which any resort Cirque models here was snow-sure in at least 9 of 11 winters is August. Resorts open on their own dates and many use snowmaking earlier.
Which resort in New Zealand has the most reliable snow?
Of those Cirque models, Treble Cone: mid-mountain was snow-sure in 3 months of the year.
Does this include snowmaking?
No. These are modelled natural snow figures only, from ERA5 weather. Groomed pistes with snowmaking often ski better than this.