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www.britannica.com/science/abyssal-zone

The zone is defined mainly by its extremely uniform environmental conditions, as reflected in the distinct life forms inhabiting it. The upper boundary between the abyssal zone and the overlying bathyal zone is conveniently defined as the depth at which the water temperature is 4° C (39° F); this depth varies between 1,000 and 3,000 m. Waters ...

en.wikipedia.org/wiki/Abyssal_zone

The abyssal zone has temperatures around 2 to 3 °C (36 to 37 °F) through the large majority of its mass. It is the deeper part of the midnight zone which starts in the bathypelagic waters above. The area below the abyssal zone is the sparsely inhabited hadal zone. The zone above is the bathyal zone.

www.untamedscience.com/biology/biomes/deep-sea-biome

Cold: The deep sea has extremely low temperatures. In fact, the beginning of the Abyssal Zone is conveniently defined as the area where water plummets to 4 degrees Celsius. At the ocean’s average depth off 4000m, the average temperature is 2 degrees Celsius. Brrr! Fish in this cold environment tend to move and reproduce very slowly.

www.answers.com/Q/What_is_the_temperature_of_the_abyssal_zone

Abyssal plain is an underwater plain on deep ocean floor, usuallyfound at depths between 3000 - 6000 meters. Abyssal zone is abyssopelagic layer of pelagic zone.

www.britannica.com/science/bathyal-zone

…abyssal zone and the overlying bathyal zone is conveniently defined as the depth at which the water temperature is 4° C (39° F); this depth varies between 1,000 and 3,000 m. Waters deeper than 6,000 m are treated separately as the hadal realm by ecologists.…

en.wikipedia.org/wiki/Abyssal_plain

Some species live in the coldest ocean temperatures of the hadal zone, while others can be found in the extremely hot waters adjacent to hydrothermal vents. Within the abyssal and hadal zones, the areas around submarine hydrothermal vents and cold seeps have by far the greatest biomass and biodiversity per unit area.

study.com/academy/lesson/abyssal-zone-definition-examples.html

The abyssal zone has no sunlight and extreme temperatures near freezing. It also has incredible pressure, up to 600 times that of the surface. Despite the harsh conditions, organisms still inhabit ...

deepseamnsmith.weebly.com/climate.html

In the first zone of the Deep Sea, the Bathypelagic Zone, light does not reach the water and the temperature can be either 5 or 6 degrees Celcius (often, temperature in this zone does not vary much). In the Abyssopelagic Zone, or the Abyssal Zone, the water is even darker and colder, keeping a fairly consistent temperature of 4 degrees Celcius.

www.weather.gov/jetstream/layers_ocean

Below the epipelagic zone is the mesopelagic zone, extending from 200 meters (660 feet) to 1,000 meters (3,300 feet). The mesopelagic zone is sometimes referred to as the twilight zone or the midwater zone as sunlight this deep is very faint. Temperature changes the greatest in this zone as this is the zone with contains the thermocline.

www.climate.gov/news-features/climate-tech/deep-argo-diving...

At 16,404 feet (5,000 meters) deep, you have reached the frontier of human knowledge: the abyssal zone, a Greek word that means “no bottom.” What happens down there? Life is sparse, but scientists suspect the deep ocean could be playing a major role in the Earth’s climate system.