Traders are warned to stop working and ask for longer breaks if the temperatures drop to 1C.
Outdoor staff must be performing at full pay & # 39; if it gets cold, based on health and safety guidelines by the Victorian Trades Hall Council.
They are also encouraged to take longer breaks of up to 30 minutes per hour if the temperature drops below 9C.
The guidelines may apply to thousands of workers in the coming days, while Australia is being hit by a bitterly cold rain shower from the South Pole region.
Melbourne shivered on its coldest May day in 19 years on Wednesday, with the CBC reaching only 10.6C.
Canberra is even colder, with the mercury reaching -4C on Friday morning.
Meanwhile, Sydney, Hobart and Adelaide will have lows between 8C and 4C over the next five days.
Traders & # 39; must be on standby & # 39; at temperatures of 1C, according to the guidelines of OHS Reps (stock image)
According to the OHS guidelines, traders must be given a half-hour break every hour between 4C and 1C, 20-minute interruptions between 7C and 4C and ten minutes between 9C and 7C.
Bosses must & # 39; exposure to extreme cold & # 39; by providing heating, shelter and waterproof clothing for their employees, according to Safe Work Australia.
Employees must be given the time to acclimatize to the cold with job rotations, according to national guidelines.
It comes after Melbourne was plagued by icy mud, wet snow and sleet on Wednesday.
In the Victoria region, Ballarat also had the coldest day in May in 19 years, reached only 5.7 ° C and registered a slight dusting of snow.
& # 39; It was just a few flurries … nothing that stayed on the ground & # 39 ;, said Tom Delamotte from the weather agency.
Working cold: health and safety recommendations for employers
Work outside in cold weather if possible protected, protected and heated with warm air blowers.
If the environment cannot be effectively controlled, a suitable work / rest regime must be applied: for example, paid rest breaks of 10 minutes per hour for temperatures between 9C and 7C, 20 minutes per hour for temperatures between 7 and 4C and thirty minutes per hour for temperatures between 4C and 1C.
(An air temperature of 1 ° C must be considered as the minimum acceptable for normal work. When the temperature reaches this point, workers must be at full strength.)
Workers who have to work in deliberately cold environments below 1 ° C – for example freezers – must be provided with suitable protective clothing and the time they use in such environments must be kept to a minimum.
Heated rest areas or shelters must be provided so that these workers can get temporary relief from the cold. Delivery of hot drinks.
Limb protection through the use of suitable protective clothing, including gloves, insulated or vapor-proof boots and face masks if necessary.
Provision of hot air jets, radiant heaters and suitable types of gloves and mittens to keep the hands warm and to maintain dexterity.
Insulation or replacement of metal handles and control beams to reduce conduction loss.
Source: Health and safety at work
Traders must be given a half-hour break every hour between 4C and 1C, a twenty-minute break between 7C and 4C and ten minutes between 9C and 7C (stock image)
Employees must be given the time to acclimatize to the cold with job rotations, according to national guidelines (stock overview)
At Oakleigh South in the suburbs, a driver was killed around 4:40 PM when an ute hit a tree, showing footage of the scene ice on the road.
In the Victoria Alps, a father and son were saved after being snowed into their cabin for two days.
The pair were led on Wednesday through snow-covered trails at Millers Hut, near Mount Wellington, after being locked up on Monday.
The warmest place in the state on Wednesday was Mallacoota in the East Gippsland region near the NSW border, which reached 14.9C.
Omeo, also in Eastern Gippsland, hit 7.6C and Hamilton in the southwest of the state dropped to 8C, while coastal areas recorded large waves.
Temperatures in much of the state fell to 5 ° C below the average, and to 7 ° C below the average in some areas.
Showers were registered along the central coast of the state and in parts of Gippsland, including Yarram in southeastern Gippsland, which received 24.2 mm.
Showers are expected to travel through Melbourne at night and until Thursday, with an expected maximum length of 8 mm.
Thursday is not expected to bring much relief from the cold, with Melbourne predicted to reach 13C.
A frost warning has been issued for the Northern, Northeast and Eastern Gippsland districts.
& # 39; We will see that the temperature in Victoria will be reasonably average by Friday & # 39 ;, said Mr. Delamotte.
Sydney follows the minimum on Thursday and Friday respectively with 8C and 9C.
Hobart fluctuates between the lowest levels of 4C and 8C in the next five days and maximals as low as 10C.
The capital of South Australia will reach a chilly 6C on Friday, but remains in line with the maximum temperatures between 14 and 17 degrees in Adelaide.
Many residents went to social media to share videos & images of the icy conditions that cover many Melbourne and the surrounding Victoria in the south
FOUR DAYS FORECAST IN YOUR CITY:
Thursday: Low 8, High 18
Friday: Low 9, High 19
Saturday: Low 12, High 19
Sunday: Low 14, High 19
Thursday: Low 7, High 13
Friday: Low 10, High 15
Saturday: Low 11, High 15
Sunday: Low 10, High 13
Thursday: Low 11, High 21
Friday: Low 8, High 20
Saturday: Low 11, High 21
Sunday: Low 14, High 21
Thursday: Low 22, High 32
Friday: Low 22, High 32
Saturday: Low 20, High 31
Sunday: Low 20, High 31
Source: Bureau of Meteorology
Thursday: Low 5, High 11
Friday: Low 8, High 15
Saturday: Low 7, High 15
Sunday: Low 7, High 14
Thursday: Low 14, High 25
Friday: Low 13, High 23
Saturday: Low 11, High 25
Sunday: Low 10, High 24
Thursday: Low 8, High 14
Friday: Low 6, High 16
Saturday: Low 8, High 16
Sunday: Low 8, High 17
Thursday: Low -2, High 12
Friday: Low -4, High 15
Saturday: Low 0, High 16
Sunday: Low -1, Max 15
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