Cold & Hot Work Environments & Adverse Weather

For hot and cold work environments and weather exposure, there is no single UK regulation specifically covering temperature extremes or weather conditions. Instead, these risks are covered by several pieces of health and safety legislation.

Primary Legislation

Health and Safety at Work etc. Act 1974

• Employers have a general duty to ensure the health, safety, and welfare of employees.
• This includes protecting workers from heat stress, cold stress, dehydration, hypothermia, sun exposure, and adverse weather conditions.

Management of Health and Safety at Work Regulations 1999

• Requires employers to carry out risk assessments.
• Weather-related risks such as extreme heat, cold, wind, rain, ice, snow, and UV exposure must be assessed and controlled.

Workplace Temperature

Workplace (Health, Safety and Welfare) Regulations 1992

• Requires indoor workplaces to have a “reasonable” temperature.
• Adequate ventilation must be provided.
• Applies mainly to indoor work environments.

Construction and Outdoor Work

For construction and outdoor workers, weather risks are often controlled through –

• Risk assessments under the Management Regulations.
• Safe systems of work.
• Appropriate PPE and clothing.
• Work scheduling and welfare arrangements.

Relevant regulations may include:

• Construction (Design and Management) Regulations 2015
• Work at Height Regulations 2005 (high winds, ice, rain affecting work at height).

Potential Consequences of an Employer Failing to Comply to the Regulations

If an employer fails to comply with Health and Safety Regulations (such as the Workplace (Health, Safety and Welfare) Regulations 1992 or the Management of Health and Safety at Work Regulations 1999), there can be serious consequences for both workers and the organisation.

Legal Action

The Health and Safety Executive (HSE) may –

• Issue Improvement Notices.
• Issue Prohibition Notices.
• Investigate incidents and complaints.
• Prosecute the employer.

Financial Penalties

• Unlimited fines in serious cases.
• Legal costs.
• Increased insurance premiums.
• Compensation claims from injured employees.

Business Impact

• Lost productivity.
• Increased absenteeism.
• Project delays.
• Equipment downtime.
• Difficulty recruiting and retaining staff.

Reputational Damage

• Negative publicity.
• Loss of client confidence.
• Damage to company reputation.
• Loss of contracts and business opportunities.

Criminal Liability

In serious cases involving negligence –

• Company directors and managers may face prosecution.
• Individuals may receive fines or imprisonment.

So what are Reasonable Workplace Temperatures?

Indoor Working Environments

The Workplace (Health, Safety and Welfare) Regulations 1992 require indoor workplaces to be kept at a “reasonable” temperature, but they do not specify a maximum temperature.

The UK’s Health and Safety Executive (HSE) provides guidance that:

• At least 16°C is normally considered reasonable for indoor workplaces.
• At least 13°C is normally considered reasonable for indoor workplaces where the work involves rigorous physical effort.

Important Points:

• These are guidelines, not legal minimum temperatures.
• Employers must assess the actual working conditions, carrying out a Risk Assessment which may include the assessment of:
  • Air temperature
  • Humidity
  • Air movement/ventilation
  • Radiant heat sources
  • The type of work being carried out
  • Length of time exposed
  • Gender of persons carry out the work
  • Age & health of persons carry out the work
  • Clothing/PPE requirements
  • Etc

Note: this is not a fully comprehensive list.

Outdoor Working Environments

Again while there is no specific UK law that sets a minimum outdoor working temperature, employers still have legal duties to protect workers from cold weather under:

• Health and Safety at Work etc. Act 1974
• Management of Health and Safety at Work Regulations 1999
• Personal Protective Equipment at Work Regulations 1992 (as amended)

Note: There are no legal minimum or maximum temperatures for outdoor work in the UK

So what are the Risks to Employees Working in a Cold Workplace?

Employees working in a cold workplace may face a range of health and safety risks, particularly if exposure is prolonged or adequate controls are not in place.

Health Risks

Cold Stress

The body’s temperature drops as it loses heat faster than it can generate it, causing:

• Discomfort
• Reduced performance
• Fatigue

Hypothermia

A serious condition where the body’s core temperature falls below normal.

Symptoms include:

• Shivering
• Confusion
• Slurred speech
• Drowsiness
• Loss of coordination
• Unconsciousness (severe cases)

Frostbite

Usually affects exposed extremities such as:

• Fingers
• Toes
• Nose
• Ears

Can cause tissue damage and, in severe cases, permanent injury.

Circulatory Problems

Cold temperatures can:

• Reduce blood circulation
• Aggravate existing heart conditions
• Increase blood pressure

Musculoskeletal Problems

Cold muscles and joints are more prone to:

• Strains
• Sprains
• Back injuries
• Reduced flexibility

Safety Risks

Reduced Dexterity

Cold hands can lead to:

• Poor grip.
• Difficulty operating tools and equipment.
• Increased likelihood of mistakes.

Reduced Concentration

Workers may experience:

• Fatigue
• Slower reaction times
• Poor decision-making

This can increase the risk of accidents.

Slips, Trips and Falls

Cold conditions may cause:

• Condensation on floors.
• Wet surfaces.
• Ice around entrances and exits.

Reduced Visibility

Cold weather may create:

• Condensation on safety glasses.
• Fogging of vehicle windows.
• Poor visibility in loading areas.

Increased Accident Risks

The combination of:

• Fatigue
• Reduced concentration
• Reduced dexterity
• Slippery surfaces

can significantly increase the likelihood of workplace accidents.

Vulnerable Workers

Attention should be given to:

• Older workers
• Pregnant workers
• Workers with medical conditions
• Those taking medication that affects circulation

Factors to Consider when Carrying out an Indoor Workplace Risk Assessment in a Cold Workplace

When carrying out an indoor workplace risk assessment for low temperatures, the employer should consider how cold conditions may affect employees’ health, safety, and ability to work effectively

Temperature of the Workplace

• Actual air temperature.
• Whether temperatures fall below recommended levels:
  • 16°C for most indoor work.
  • 13°C where the work involves strenuous physical effort.

Nature of the Work

• Sedentary work (office-based workers may feel cold more quickly).
• Physical work (workers generate more body heat).
• Duration of exposure to cold conditions.

Air Movement and Draughts

• Draughts from doors, windows, or ventilation systems.
• Air conditioning systems causing excessive cooling.
• Frequency of doors being opened in warehouses or loading bays.

Individual Factors

• Age and health of employees.
• Medical conditions affected by cold.
• Pregnancy.
• Vulnerable workers who may be more susceptible to cold stress.

Clothing and PPE

• Suitability of work clothing.
• Availability of thermal or insulated clothing where required.
• Whether PPE contributes to or reduces cold exposure.

Workplace Design and Heating

• Adequacy and reliability of heating systems.
• Insulation of the building.
• Localised cold spots near entrances, loading bays, or refrigeration units.

Welfare Facilities

• Access to heated rest areas.
• Availability of hot drinks.
• Suitable welfare and break facilities.

Slips, Trips and Falls

Cold conditions can increase risks from:

• Condensation on floors.
• Wet surfaces.
• Ice forming at entrances and exits.

Signs of Cold Stress

Assess the likelihood of workers experiencing:

• Shivering
• Numbness
• Reduced dexterity
• Fatigue
• Reduced concentration
• Hypothermia (in severe cases)

Factors to Consider when Carrying out an Outdoor Workplace Risk Assessment in a Cold Environment

Employers must assess risks from

• Low temperatures
• Wind chill
• Rain and snow
• Ice
• Prolonged exposure
• Reduced daylight and visibility

Suitable Clothing and PPE

Where required, employers should provide:

• Insulated clothing
• Waterproof clothing
• Thermal gloves
• Suitable footwear with slip-resistant soles
• Head protection appropriate for cold conditions

Welfare Facilities

Workers should have access to:

• Heated rest areas or shelters
• Warm drinks
• Facilities to dry wet clothing
• Suitable break arrangements

Work Organisation

Employers may need to:

• Reduce exposure times
• Rotate workers
• Schedule tasks around severe weather
• Increase the frequency of warming breaks

Training and Supervision

Workers should be able to recognise signs of:

• Hypothermia
• Frostbite
• Cold stress

Severe Weather Considerations

Work may need to be postponed or stopped if conditions create unacceptable risks, for example:

• Ice causing slip hazards
• Heavy snow
• Extreme wind chill
• Reduced visibility
• Unsafe access routes

This is particularly important for:

• Construction work
• Utility work
• Road maintenance
• Agriculture
• Work at height

Hierarchy of Typical Control Measures to be Considered When Working in a Cold Workplace

When working in a cold workplace, control measures should follow the hierarchy of control, with the aim of eliminating or reducing exposure to cold as far as reasonably practicable.

Note: this is not a definitive list of controls.

Eliminate the Hazard

Remove the need for workers to be exposed to cold conditions where possible.

Examples:

• Relocate work to a heated area.
• Perform tasks remotely or from a warmer location.
• Automate processes in cold environments.

Engineering Controls

Modify the workplace to reduce exposure to cold.

Examples:

• Install heating systems.
• Improve insulation.
• Fit draught excluders on doors and windows.
• Use air curtains at entrances.
• Enclose cold work areas.
• Provide heated shelters or cabins.

Administrative Controls

Change the way work is organised.

Examples:

• Limit exposure times.
• Rotate workers between cold and warm tasks.
• Schedule work during warmer periods where possible.
• Increase the frequency of warm-up breaks.
• Monitor weather conditions and workplace temperatures.
• Provide training on cold stress and hypothermia.

Welfare Measures

Provide facilities to help workers recover from cold exposure.

Examples:

• Heated rest rooms.
• Access to hot drinks.
• Drying facilities for wet clothing.
• Adequate welfare facilities.

Personal Protective Equipment (PPE)

Use PPE as the last line of defence.

Examples:

• Thermal clothing.
• Insulated gloves.
• Thermal socks and footwear.
• Hats or head protection suitable for cold conditions.
• Waterproof outer garments where required.

Monitoring and Supervision

Employers should also:

• Monitor workers for signs of cold stress.
• Check heating systems are functioning correctly.
• Review risk assessments during periods of severe weather.

Hot Workplaces (Indoor & Outside)

There is no legal maximum or minimum workplace temperature in the UK.

However, employers must:

• Assess risks from heat – carry out a Risk Assessment.
• Act if employees are uncomfortable or at risk of heat-related illness.
• Provide controls such as –
  • Ventilation or cooling
  • Drinking water
  • Rest breaks
  • Shade (for outdoor workers)
  • Changes to working hours

What are the Risks to Employees Working in a Hot Workplace?

Employees working in a hot workplace can experience both health risks and safety risks if heat exposure is not properly controlled.

Health Risks

Heat Stress

Occurs when the body cannot cool itself effectively.

Symptoms include:

• Excessive sweating
• Headaches
• Dizziness
• Fatigue
• Irritability
• Difficulty concentrating

Dehydration

Caused by excessive fluid loss through sweating.

Effects include:

• Thirst
• Dry mouth
• Reduced physical performance
• Fatigue
• Increased risk of heat-related illness

Heat Exhaustion

A more serious condition caused by overheating and dehydration.

Symptoms include:

• Heavy sweating
• Weakness
• Nausea
• Muscle cramps
• Fainting
• Rapid pulse

Heat Stroke

A medical emergency where the body’s temperature control system fails.

Symptoms include:

• Confusion
• Loss of consciousness
• Seizures
• Hot, dry skin
• Very high body temperature

Heat stroke can be fatal if not treated immediately.

Skin Conditions

• Heat rash
• Sunburn (for outdoor workers)
• Increased risk of skin damage from UV exposure

Safety Risks

Reduced Concentration

Heat can affect mental performance, leading to:

• Poor decision-making
• Reduced alertness
• Slower reaction times

Fatigue

Workers may become tired more quickly, increasing the likelihood of:

• Errors
• Accidents
• Near misses

Reduced Physical Performance

Heat can cause:

• Loss of strength
• Reduced endurance
• Poor coordination

Increased Accident Risk

The combination of heat stress, dehydration, and fatigue can increase the risk of:

• Slips, trips, and falls
• Vehicle incidents
• Machinery accidents
• Manual handling injuries

Higher-Risk Workers

Extra consideration should be given to:

• Older workers
• Pregnant workers
• New starters not acclimatised to the heat
• Workers with medical conditions
• Workers wearing heavy PPE or respiratory protection

As is evident the health and safety risks posed to employees can be extremely serious when working in a Hot Workplace, hence the requirement to carry out a suitable and sufficient Risk Assessment. 

Factors to Consider when Carrying out a Hot Workplace Risk Assessment

When carrying out a hot workplace risk assessment, employers should consider the factors that can contribute to heat stress, dehydration, fatigue, and reduced concentration.

Environmental Factors

• Air temperature
• Humidity levels
• Air movement/ventilation
• Radiant heat from the sun, furnaces, machinery, or hot surfaces
• Indoor vs outdoor working
• Weather conditions (for outdoor work)

Work Factors

• Physical demands of the task
• Work rate and workload
• Duration of exposure
• Availability of rest periods
• Lone working arrangements

Individual Factors

• Age and fitness
• Existing medical conditions
• Pregnancy
• Acclimatisation to hot conditions
• Previous heat-related illnesses
• Medication that may affect heat tolerance

Clothing and PPE

• Heavy or impermeable clothing
• High-visibility clothing
• Respiratory protective equipment (RPE)
• Other PPE that may restrict cooling or increase heat load

Hydration and Welfare

• Availability of drinking water
• Ease of access to water
• Welfare facilities
• Shaded or cooled rest areas
• Opportunities for recovery breaks

Signs of Heat Stress

Assess whether workers may experience:

• Excessive sweating
• Dizziness
• Headaches
• Fatigue
• Muscle cramps
• Heat exhaustion
• Heat stroke (medical emergency)

Hierarchy of Typical Control Measures to be Considered When Working in a Hot Workplace

For a hot workplace, control measures should follow the hierarchy of control where possible, reducing workers’ exposure to heat and preventing heat-related illness.

Note: this is not a definitive list of controls. 

Engineering Controls

• Improve ventilation.
• Install air conditioning or cooling systems.
• Use fans to increase air movement.
• Insulate hot pipes, equipment, and surfaces.
• Install heat shields or reflective barriers.
• Enclose hot processes where practicable.

Administrative Controls

• Schedule heavy work during cooler parts of the day.
• Reduce the duration of exposure.
• Introduce job rotation.
• Increase the frequency of rest breaks.
• Monitor weather forecasts and workplace temperatures.
• Implement a heat stress management plan.
• Train workers to recognise symptoms of heat stress.

Welfare Measures

• Provide plenty of cool drinking water.
• Ensure easy access to hydration stations.
• Provide shaded or air-conditioned rest areas.
• Encourage regular fluid intake before workers become thirsty.

PPE and Clothing

• Use lightweight, breathable clothing where possible.
• Provide sun hats and UV-protective clothing for outdoor workers.
• Use cooling vests if appropriate.
• Review PPE requirements to ensure they do not create unnecessary heat stress. 

Health Monitoring

• Supervise workers for signs of heat stress.
• Monitor vulnerable workers more closely.
• Encourage workers to report symptoms early.
• Have emergency procedures for heat exhaustion and heat stroke.

We trust this gives you an insight in to how you can best control your working environments and work activities to protect your employees. However, if you require more information please free to call us on 01623 753 654 For a no pressure discussion on your requirements.