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Running in the rain can be great fun, with a wonderful sense of freedom. However, it does offer some interesting challenges.
The rain can cool you off. In the summer this could be pleasant, but in cooler conditions, it can be a serious problem. Even a light rain can soak you through and cool you off dramatically. A heavy rain in cool conditions can rapidly cause [[Hypothermia]]. If you stop running, you can become chilled very quickly. Shivering is a key indicator of your core temperature - see the notes on [[Hypothermia on the previous entry ]] and [[Running in the Cold]].
* A thin rain jacket can provide important protection and comfort. It is unlikely to keep you dry - you will probably sweat under the jacket, but it will prevent a lot of the evaporative cooling as well as the cooling effect of heavy rain.