Jordan is a pleasant place to go all year round. It is very hot in summer so you may prefer autumn or spring.
You will need a passport that is valid for 6 months after you enter the country. A visa is obligatory and can be obtained at the airport or land border crossings (except the Allenby/King Hussein Bridge).
There are no obligatory vaccines. But you are advised to make sure your Typhoid and Hepatitis A are up to date.
The price of a return ticket can vary according to the date of your trip to Jordan, when you buy your ticket, and the airline.
Jordan is 2 hours ahead of Washington. When it is noon in Washington it is 2 p.m. in Amman.
The kingdom's official language is Arabic. Howver, people in the tourist business, and a majority of the population speak English.