The rain, like the wind, can be an incentive that will help us to make our training more intense tad. Wear reflective clothing is very necessary. Although the weather is likely to reduce your speed, if you are in good physical condition, use it to your advantage to work endurance; greater efforts to involve the legs and lungs. To do this, shorten your stride; the more time you spend without your feet touching the surface, the greater your resistance.
Prepare your routes. Logically, you should adjust the itineraries to weather conditions. Not just jogging in spring by a decamped area that I do in the rain. Avoid roads where many puddles and if you allow temporary refuge becomes more intense. On the other hand, it is not recommended going out on stormy days, if must go out, then wear a raincoat with reflective tape.
Dress smartly. Bring a first layer (a thermal shirt, for example) and other outside as windbreaks, waterproof material such as nylon or the like. It is essential to keep dry when the rain surprises us and also maintain body temperature. You can also consider wearing a visor with reflective material, there are plastic to keep the rain bother your eyes. Do not forget gloves to protect your hands from the cold.
Bring neon elements. The winter light is scarce; especially when it rains, and makes worse the visibility for drivers. Try to always wear a reflective band, yellow, pink etc. Even some sports garments are made with reflective fabric. Check your footwear. Maybe you are too worn or slipping because of the rain, and you need to invest in some new shoes. It is important that the feet are kept warm and dry; there are models made for it in impervious materials such as Gore-Tex.