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The dump months are what the film community calls the two periods of the year when there are lowered commercial and critical expectations for most new releases from American filmmakers and distributors. Domestic audiences during these periods are smaller than the rest of the year, so no tentpole movies are released. January and February are usually most commonly described this way, with August and September sometimes included. Releases during those times primarily include films that would have been released at other times of year had they done better at test screenings, films with less prominent stars, genre films, movies that cannot be easily marketed and films intended for a teenage audience, which has fewer entertainment options outside the home.

Ianuarius, fully Mensis Ianuarius, was the first month of the ancient Roman calendar, from which the Julian and Gregorian month of January derived. It was followed by Februarius ("February"). In the calendars of the Roman Republic, Ianuarius had 29 days. Two days were added when the calendar was reformed under Julius Caesar in 45 BCE.

Nivôse was the fourth month in the French Republican Calendar. The month was named after the Latin word nivosus, which means snowy.

Pluviôse was the fifth month in the French Republican Calendar. The month was named after the Latin word pluviosus, which means rainy.