> Last week we had all sorts of harsh whether (sub-zero temps, heavy rain, snow) during my morning commute, which didn't seem to affect bike traffic one bit.

I'd like to corroborate the sibling comment: this is not true. Although not in Amsterdam, elsewhere in the Netherlands I consistently park my bike in the same parking around the same time, and it usually fills up at about the same pace. Far fewer spaces were taken when I parked my bike during the harsh weather than there were usually.