Adapted from the CDC:
If you happen to work outside during the winter months, there are many risks. Some of these risks may be easier to detect than others; therefore, it is important to be prepared.
If you work in the cold, several layers of loose clothing is recommended. Layering provides better insulation than otherwise.
Wear gloves to protect your hands, and a hat/hood for your head. If your environment is wet, waterproof shoes with good traction are recommended. It is also important that your clothing does not interfere with your eyesight.
Be prepared for cold weather, even if the temperature currently seems pleasant. Conditions may change quickly and you could suffer from cold-related illnesses and injures in 60 degrees Fahrenheit.
Hypothermia can be hard to recognize and can occur when your body temperature drops below 95 degrees Fahrenheit. Mild hypothermia can result in confusion and lack of judgment. Early symptoms include shivering, fatigue, and loss of coordination. Due to the loss of heat, your body will stop shivering, skin may turn blue, eyes will dilate, breathing will slow and loss of conscious will occur. To prevent hypothermia, it is recommended to wear clothes in layers.
Frostbite occurs when a part of the body such as fingers, toes, nose and ears, freezes to the point in which tissue is damaged. If the body tissue cannot be saved, removal is recommended. You can avoid frostbite by being alert in a cold environment with layered clothing and hat, gloves, etc.
Other cold related injures include trench foot and chilblains. Trench foot occurs when your feet are wet and it is cold for an extended period of time. Moisture causes the loss of heat and poor circulation. Chilblains can occur due to cold weather damaging an individual skin. The result is broken skin, swelling, blisters, redness, and itching. Trench foot and Chilblains can occur in 60 degrees Fahrenheit.
Therefore, if you work in the cold, please wear appropriate clothing for outdoor conditions. It is also recommended to alert your supervisor if you are not warm enough and seek attention. Cold temperatures can affect your judgment and reaction time. For more information, please visit: http://www.cdc.gov/features/workingincold/ and for additional information about hypothermia and other cold weather injuries, see the NIOSH Fast Facts card, Protecting Yourself from Cold Stress[PDF – 576KB].