Most of the answers here are mostly incorrect. The launch window is actually based on the time of year and the climate at the launch site. Altitude can also come into play. In essence, the weather conditions must be such so as to allow optimal operation of the launch window. If the temperature is too low for example, then the launch window hinges may freeze and not allow it to freely open. Fog may also form on the launch window and then the launch is pretty much scrapped. The more you know!
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