Can anyone tell me if weather affects how long it takes to make CS?

When I got my silverpuppy I made several batches during the summer when it was 
bright and dry with the air conditioning on.  It took about 6 hours max.  I 
made 
some today when it was grey and rainy and it took 11 hours.  Same jar and home 
double distilled water.  Wiped off the electrodes with a white paper towel and 
rinsed the bottle with distilled water before starting.  Nothing different.

I would like to understand what may have affected the length of time since it 
was almost double.
Thanks.
PT