There are two seasons: the dry season prevails from October through May; the wet season runs from June to September. Temperatures are determined by altitude, with highlands (including Addis Ababa) rarely exceeding 25º C. to 35o C.
The local currency is the Ethiopian Birr, made up of 100 cents. Visitors may import an unlimited amount of foreign currency, providing declaration of such currency is made to Customs on arrival. Foreign currency may only be changed at authorized banks and hotels. The currency declaration form must be retained as this will be required by Customs on departure. Visitors, however, will be able to change back any excess Ethiopian Birr to foreign currency at the airport before departure.
If you do have Ethiopian Birr cash in at the airport, you must, in addition to the currency declaration form, bring with you all receipts for exchange transactions. Credit card acceptance is now growing throughout the country but not yet in all main cities.
Prior to entry, visitors should be in possession of a valid health certificate for yellow fever. Vaccination against cholera is also required for any person who has visited or transited a cholera-infected area within six days prior to arrival in Ethiopia.
Lower lying areas of Addis Ababa (around 2000 meters) are now said to be potentially malarial, but essentially the city is malaria free, although non-malarial mosquitoes can be nuisanc.