How does the weather affect static electricity?
You may have noticed that you tend to get more static shocks when the air is particularly dry. On damper days, water molecules in the air allow excess electrons to dissipate slowly into the atmosphere, preventing a hefty build up of static charge. Dry air, on the other hand, means that charges have nowhere to go, encouraging the accumulation of static charges and increasing your chances of getting a shock.
source: http://www.physics.org/article-questions.asp?id=44
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