This site will help you manage how the temperature in your workplace affects your employees.
It explains the concept of thermal comfort, and contains specific advice on heat stress, dehydration and cold stress when working at very high or low temperatures.
When working outdoors, the effects of the weather can potentially have a very serious impact on an employee's welfare.
HSE does not have specific guidance for working in cold environments where temperatures are below 13°C. In such situations you will likely be complying with the law if you work in accordance with British/European Standards but you can demonstrate compliance by alternative means.
Heat stress is an issue for people working in high temperatures all year round (eg bakeries, compressed air tunnels, foundries). But this information can also be used during the summer months when there can be an increased risk of heat stress for some people.