If you are looking to take some clear shots of the stars in the night sky, the best time to try is in the winter or on cold nights.
One element that distorts pictures of the sky is moisture. While this at it's most dramatic this moisture takes the form of clouds, there is some degree of moisture in the sky all the time. The capability of the air to hold moisture is dependent on temperature, so warm air holds more moisture than cold air.
The clearest pictures are available on the coldest nights since the air lacks the capacity to hold much moisture, so starlight passes through the atmosphere with very little distortion when it is cold out.
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