Rain intermittent throughout the year. The best time to visit is late spring. The least rain falls in the months of Mar-Jun. Airport - 14km SW of Amsterdam. Rotterdam Airport - 7km NW of Rotterdam.
Business is reasonably formal.
An appointment is advisable and business cards are important. A meeting is likely to be conducted in English. Alcohol is available and smoking is generally acceptable. Raincoat useful anytime. Beware of clyclists, there are often special cycle lanes.