Typical operating window
July–SeptemberSouthern winter storms usually build the operating base from June into July.Verified planning context
Snow, weather and avalanche context
Historical patterns help you compare trips. They do not predict your week or replace the operator's daily decisions.
Strongest comparable snow evidence
3.10 m published average · 1.84–5.53 m observed rangeMount Larkins electronic weather stationTier B · observed reference · low confidenceSnow character
transitionalCold snow follows southerly storms; northwesterly wind, sun, and warming can rapidly alter exposed surfaces.Public avalanche information
NZAA Wānaka and Wakatipu regionsPublic NZAA forecasts are not for commercial operators. They provide guest context only.Weather and flight context
Strong westerly gradients create major differences between the Main Divide and eastern basins.
- Nor’west wind
- Orographic cloud
- Fast warming and flat light
Meteorological reference area
Queenstown and Wānaka program context
- Includes
- Queenstown and Wānaka program areas and their named alpine reference sites.
- Excludes
- Aoraki, Tasman Glacier, and Canterbury profiles.
- Elevation
- No verified operator-terrain elevation band is public. Each evidence value retains its site elevation.
Evidence pack
Measurements, claims and gaps stay separate.
Tier BObserved winter snowfall reference3.10 m published average · 1.84–5.53 m observed range
- Site
- Mount Larkins electronic weather station · 1900 m · Distance unavailable — the source summary does not publish station coordinates
- Period
- Twelve winters; exact years are not listed in the published summary
- Completeness
- Twelve-year summary; annual values and missing periods are not published on the source page.
- Method
- Earth Sciences New Zealand published mean and observed minimum-to-maximum winter snowfall.
- Limitation
- The station is one east-of-divide reference and does not represent all Queenstown or Wānaka terrain.
- Winter snowfall summary from high-elevation stationsEarth Sciences New Zealand · accessed 2026-08-25
Tier CModelled snowfall water equivalent321 mm SWE median · 262–365 mm interquartile range
- Site
- Queenstown ERA5-Land grid cell · -45.0000, 168.7000 · 4.5 km from Queenstown reference point
- Period
- Calendar years 1991–2020
- Completeness
- 360 monthly means; all 30 calendar years contain 12 values.
- Method
- ERA5-Land monthly mean daily snowfall accumulation was multiplied by calendar days and 1,000, then summed by calendar year.
- Limitation
- This reference area supports evidence discovery and comparison. It is not an operating-area or tenure boundary. The sampled gateway cell can differ substantially from ski elevations. This unadjusted 0.1° reanalysis grid cell is not an observation, snow depth, or terrain-wide total. Grid elevation and wind redistribution can cause substantial local bias.
- ERA5-Land monthly averaged data from 1950 to presentCopernicus Climate Change Service · accessed 2026-08-26
Monthly evidence
Each cell keeps its measurement type and unit. Reanalysis water equivalent is not snow depth. Text-only cells preserve a representative data gap.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.2 mm SWE | 0.1 mm SWE | 1.2 mm SWE | 6.3 mm SWE | 26.1 mm SWE | 52 mm SWE | 45.5 mm SWE | 46 mm SWE | 39.8 mm SWE | 36 mm SWE | 16.4 mm SWE | 2.1 mm SWE |
Commercial operator assessment
Operator assessment process not independently verifiedThe operator must assess current snow, avalanche terrain, weather, aircraft limits, and rescue options. No private operational plan is inferred.
Sources and evidence notes
- WMO Climatological NormalsWorld Meteorological Organization · accessed 2026-08-25
- ERA5-Land hourly data from 1950 to presentCopernicus Climate Change Service · accessed 2026-08-25
- New Zealand Avalanche AdvisoryNew Zealand Mountain Safety Council · accessed 2026-08-25
- Published operator and trip inventoryHeliski International editorial team · accessed 2026-08-25
- Winter snowfall summary from high-elevation stationsEarth Sciences New Zealand · accessed 2026-08-25
- ERA5-Land monthly averaged data from 1950 to presentCopernicus Climate Change Service · accessed 2026-08-26
- What is the New Zealand Avalanche Advisory?New Zealand Mountain Safety Council · accessed 2026-08-25