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Sunshine is abundant year-round on the Rio Grande. While this sounds welcoming, heat stroke and heat exhaustion are dangers to guard against during the hot months. Conversely, hypothermia is a life-threatening danger during the balance of the year. Infrequent and brief periods of cloudy weather are confined mostly to the winter months. Appropriate clothing and other gear should be carried from November through April as cold fronts can bring freezing weather with rain or snow. The "rainy season" extends from mid-July through early October and can result in locally heavy thunderstorms and flash floods. Rapid river rises can be dangerous if unprepared. Relative humidity is normally between 25% - 40% year around.
http://www.nps.gov/bibe/weather.htm
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