The weather in Kerala is comfortable from late October to May; June to September is monsoon season. Kerala has three airports that serve international and domestic destinations: Kochi, Thiruvananthapuram, and Kozhikode. All foreign visitors require an Indian visa. You can get around in private taxis, or take tourist buses and trains for longer distances. Malayalam is the local language, but English is widely understood. Local transactions are made in the Indian rupee (INR); hotels, big stores, and restaurants accept credit cards, but smaller establishments might not. ATMs are widely available. Most bills include a service charge in lieu of tip; if this is not added, it's common to tip 10%. Electricity is 220 volts.