Climate

Climate is a descriptor used by the IISS to denote average planetary temperate ranges.

• It is not designated in the UWP, but it was semi-regulated by the time of the T5SS using trade codes.
• Climate codes by the IISS are filed as Trade Classifications.
• Please also see: Climate and Density Key

Description (Specifications)

Climate and weather are fantastically complicated things affected by dozens upon dozens of factors. With a few exceptions due to fantastically exotic conditions, most planets have a wide variety of climates, biomes, microclimates, ecological zones, and environments. The single-biome world is, for the most part, a very rare fantasy.

• Climatological trade codes represent an equatorial mean climate band average reading.
• Example: For Earth, this is 22. On Earth, with an axial tilt of 23 degrees, the Climate at season height sometimes ranges from minus -73 to 46, and the overall mean temperature is 16. Earth's hottest temperature has been recorded at 70 and coldest at -89.
• Smaller worlds will have less variation. Faster rotation will have less variation. Lower axial tilt will have greater variation at any time of the day, but less variation on any given day (that is, the poles will not get as cold relative to the equator).

T5SS Climate Categories Table

The descriptors are as follows:

T5SS Climate Categories

Climate:	Temperature Range: (Degrees Celsius)	T5SS TC:	Orbit:	Lifeforms:	Remarks:
Vacuum (none)	Extreme: Almost always cold or frozen.	Va (vacuum) As (asteroid or planetoid)	Any	Unconventional Life or Exotic Life (extremophile)	Impossible: Habitation is almost always impossible without extensive technology. Usually associated with worlds without atmospheres. In such cases, the climate of the world is often determined by mean distance from the local star.
Frozen (frigid)	Below -30	Fr (frozen) Ic (iceworld)	HZ +2	Conventional Life (cryomorph)	Nigh Impossible: Habitation is near impossible without technology.
Very Cold	-30 to -20	Vc (very cold) Ic (iceworld)	HZ +1	Conventional Life (hypercryophile)	Not Hospitable: Habitation is very difficult.
Cold	-20 to -5	Co (cold) Ic (iceworld)	HZ +1	Conventional Life (cryophile or psychrophile)	Unhospitable: Habitation is difficult.
Chilly	-5 to 5	Ch (chilly)	(HZ plus)	Conventional Life (normative: mesophile)	Semi-Hospitable: Still marginally habitable. 0 degrees C = freezing point of water.
Cool	5 to 15	Tu (tundra) (Terra-norm) Nrm- (cool normal)	(HZ plus)	Conventional Life (normative: mesophile)	Hospitable: Still habitable. In the Habitable Zone or Goldlilocks Zone.
Normal (optimal)	15 to 25	Tp (temperate) Ga (garden or gaia) (Terra-prime) Nrm (normal) (Terra-norm)	HZ	Conventional Life (normative: mesophile)	Very Hospitable: Very conducive to life. Almost every Garden World or Terra-prime world possess this ideal climate. In the Habitable Zone or Goldlilocks Zone.
Warm	25 to 40	Wa (warm) (Terra-norm) Nrm+ (warm normal)	(HZ neg)	Conventional Life (normative: mesophile)	Hospitable: Still habitable. In the Habitable Zone or Goldlilocks Zone.
Tropical	40 to 50	Tr (tropical)	(HZ neg)	Conventional Life (normative: mesophile)	Semi-Hospitable: Still marginally habitable.
Hot	50 to 60 (122 to 240 F)	Ho (hot)	HZ -1	Conventional Life (thermophile)	Unhospitable: Habitation is difficult.
Very Hot	60 to 70	Vh (very hot)	HZ -1	Conventional Life (hyperthermophile)	Not Hospitable: Habitation is very difficult. Inferno worlds.
Inferno (torrid)	70+	If (infernal)	HZ -2	Conventional Life (thermomorph)	Nigh Impossible: Habitation is near impossible without technology. 100 degrees C = boiling point of water. Typical of hellworlds, insidious worlds, many radworlds, and worlds with too many greenhouse gases. Venus (SR 1827) (world) is typically thought of as an exemplar world for this category.
Variable (chimeric)	Extreme: Variable	Lk (locked: satellite or moon) Tz (twilight zone: mainworld)	Starward or Any	Unconventional Life or Exotic Life (extremophile)	Impossible: Habitation is almost always impossible without extensive technology. Often reserved for worlds that have large variations in temperature due to eccentric orbits or significant axial tilts.

See also

Universal world profile

§ == ( Please refer to the following AAB Library Data for more information: ) == §

• Main world
• Hex Number
• Universal World Profile
  • Starport (Sp)
  • Planetary Size (S)
  • Atmosphere (A)
  • Hydrosphere (H)
  • Population (P)
  • Government (G)
  • Law Level (L)
  • Tech Level (TL)
• Trade classification & Sophont Codes
• Importance Extension (Ix)
• Economic Extension (Ex)
• Cultural Extension (Cx)
• Nobility
• Bases
• Travel Zone
• PBG - Population, Belts, Giants
  • P: Population Multiplier
  • B: Belts
  • G: Gas Giants
• Worlds
• Allegiance Code
• Stellar Data
• COG Sequence
  • C: Climate
  • O: Orbit
  • G: Gravity

References & Contributors (Sources)

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This list of sources was used by the Traveller Wiki Editorial Team and individual contributors to compose this article. Copyrighted material is used under license from Far Future Enterprises or by permission of the author. The page history lists all of the contributions.

• Marc Miller. Scouts (Game Designers Workshop, 1983), 4-6.
• Periodical: Journal of the Travellers' Aid Society 20 in Article: "Temperature in Traveller, a Scouts Variant" by: J. Andrew Keith
• Joe Fugate. Grand Survey (Digest Group Publications, 1986), TBD.
• Jon F. Zeigler. First In (Steve Jackson Games, 1999), TBD.
• Traveller Wiki Editorial Team
• Author & Contributor: MIMIC - Minor Imp of the Ministry of Information and Communication
• Author & Contributor: Garnfellow
• Author & Contributor: Lord (Marquis) and Master of Sophontology Maksim-Smelchak of the Ministry of Science