Lumen Sites for mine & construction sites

West Coast Tasmania weather for site work

The West Coast of Tasmania is one of Australia’s oldest mining regions: base metals at Rosebery, tin and tungsten at Renison Bell, gold at Henty and iron ore at Savage River, with Queenstown beside the Mount Lyell copper mine, now on care and maintenance. The region faces the westerly winds off the Southern Ocean, which make it one of the wettest parts of Australia. Heat is almost never the problem here; rain, wind and cold are.

The year at a glance

Annual rain is 2,415–2,641 mm, more than four times Hobart’s 561 mm, and it falls on 208–217 days a year, so more days bring rain than not. July and August are the wettest months, with about 300–345 mm in August, and even the driest months average more than 100 mm. Summers are mild, with January highs of 20–21°, and winters are cold and raw: July days reach only 10–11° and nights average 3–5°.

Averages for 1995–2024 from SILO (Queensland Government, CC BY 4.0), interpolated from Bureau of Meteorology observations. Heat-stress days: estimated WBGT reaching 28°, the caution level Lumen Sites starts with. Select a town for its month-by-month figures.
Town	January high	July low	Rain a year (mm)	Wettest month	Heat-stress days
Queenstown	21°	4°	2,641	Aug 332 mm	1
Zeehan	21°	5°	2,415	Aug 301 mm	1
Rosebery	20°	3°	2,623	Aug 344 mm	under 1

Cold, not heat

Heat stress is rare: about one heat-stress day a year in Queenstown and Zeehan and less than one in Rosebery, and in the 30 years from 1995 to 2024 none of the three towns reached 35°. Cold is the bigger risk. Rain, wind and winter days of 10–11° quickly chill crews working outside in wet gear, so plan for dry clothing, warm crib rooms and shorter spells outside in the worst weather.

Rain, cloud and slopes

Rain days by month

Average rain days a month (1 mm or more), 1995–2024. From SILO (Queensland Government, CC BY 4.0), interpolated from Bureau of Meteorology observations.
Town	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Queenstown	12	11	15	17	20	18	20	22	21	20	15	16
Zeehan	12	11	16	16	20	19	21	23	22	20	15	16
Rosebery	13	11	16	17	20	20	22	24	22	20	15	17

Rain is the constant. From May to September it rains on about 18–24 days a month, and even January brings rain on about 12. Roads, benches and stockpiles rarely dry out, cuttings and slopes can slip after long wet spells, and rivers rise quickly in heavy falls. Low cloud and fog often sit on the ranges and can hold up aerial and survey work. More in rain, the wet season and haul roads.

Wind and snow

The West Coast takes the full force of the prevailing westerlies. A steady procession of cold fronts in winter and spring brings squalls, strong gusts and bursts of rain and hail, so cranes and work at height need gust checks: see gust forecasts for cranes and work at height. Snow falls on the surrounding ranges in most winters and occasionally reaches the towns, and the roads over the ranges can be icy or closed.

Storms and lightning

Thunderstorms are less common here than on the mainland, but cold fronts and the showery air behind them can bring lightning, small hail and sudden squalls at any time of year, so the lightning plan still matters: see lightning stand-down alerts.

Planning a year on site

Plan big outdoor jobs for November to March, the least wet stretch, with January and February the driest months, and still expect rain on 11–17 days a month.
Build for wet ground all year: drainage, sediment control and regular road maintenance.
Keep spare dry clothing and warm shelter on site; here cold and wet are a bigger risk than heat.
Check gust forecasts before lifts when a front is due.
In winter, check the roads over the ranges before travel, since snow and ice can close them.