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I noticed that my XT wheelset has lost some tension. This might be because I've been pushing the envelope for a 24 spoke wheel, but I suspect that this perceived loss of tension might be because of a difference in expansion rates between aluminum and steel.

In cool weather, I would expect that the rim contracts, reducing the circumference. Because steel expands and contracts less than aluminum, I would expect a reduction in tension. So I offer a science project -- predict and then measure the variation in spoke tension between a summer day (115 degrees where I live) and a winter morning (around 35 degrees).
 

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You might notice a greater variation in spoke tension due to a pressure variation in your tires, than from differential expansion/contraction of the spokes/rims. Air pressure also changes with temperature.
 
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