The Chicago Mercantile Exchange today announced that it is expanding its suite of weather derivatives and rolling out CME Weekly Weather Index futures and options on 18 U.S. cities beginning April 2.

The CME now offers Monthly and Seasonal Heating Degree Days and Cooling Degree Days contracts on 35 cities around the world (18 throughout the U.S., nine in Europe, six in Canada and two in Japan). The contracts quantify weather in terms of degrees above or below monthly or seasonal average temperatures and attach a dollar amount to the number of degrees a month’s or season’s temperature deviate from an average value for that particular city. The new contract will measure the deviations in terms of weeks.

“By listing weekly weather contracts, CME is offering another alternative for our customers to hedge their risk associated to weather,” Felix Carabello, director of CME Alternative Investment Products, said. “In addition to monthly and seasonal hedges, customers will now have the opportunity to have more defined hedges on a shorter time frame. This flexibility allows for multiple options to fit a variety of risk management strategies.”

Six of the CME Weekly Temperature contracts are scheduled to be launched on April 2, including those for Atlanta, Boston, Chicago, Cincinnati, Dallas and New York City. On April 16, CME Weekly Temperature contracts will be added for Baltimore, Des Moines, Detroit, Houston, Kansas City, Las Vegas, Minneapolis-St. Paul, Philadelphia, Portland, Sacramento, Salt Lake City and Tucson.

The futures contracts will trade only on the Globex electronic trading platform from 5 p.m. to 3:15 p.m. Chicago time the following day. Trading on all of the contracts will terminate at 9 a.m. Chicago time on the first exchange business day that is at least two calendar days after the last calendar day of the respective contract period. Options on all CME weather futures will be traded on CME’s trading floor from 8:30 a.m. to 3:15 p.m. Chicago time.

The CME’s weather derivatives were introduced in 1999. In 2006, nearly 800,000 weather contracts worth a notional value of US$21 billion traded at CME.