Cold Weather & Suspension Springs...

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...very curious thing happened to a friends car - came back after Xmas to find the front drivers side suspension spring had snapped. It was parked up last Tuesday driving fine and then when it was started up yesterday the spring had snapped. The car had not been driven in the meantime. Could the cold weather make a suspension spring snap? Thats the only possible thing I can think of....

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Its a 55 reg Saab 9-3 convertable, was under a couple of inches of snow for a few days....the spring has a rubber sheath, no evidence of rusting though...

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Sorry to revive this thread but I have a question for any mechanics and the like - would it not be good practice to replace both springs when one has snapped? The mechanic its been taken to has said he's just doing the one that snapped....