The following is definitivly not an exhaustive list, but it can give you an idea of what actually influences a person and culture. Depending on the kind of culture you write some things will be far more important than others, but all of them depend on each other. Biology influences Sociology; religion, science and politics are interwined and climate writes history, etc, etc.
And if something does not fit into the whole, if theres a break, something that makes the reader go “huh. Why do I have airplanes among my mediavial peasants” – that better be a plotpoint, lest you pull the reader out of your story.
Climate and Geography
Geographical features like vulcanos, mountains, coasts, woods, plains, deserts, swamps, rivers. Light conditions, seasons (cold, warm, mild, dry, wet?), prone to storms or other severe weathers, flora, fauna, food supply, water supply, predators and other moving natural dangers, possible trade and marching routes and their chokepoints
Biology
Biological necessities: Ammount of food, water, light, rest, sleep, necessary climate, social contact. Kind of illnesses when necessarity aren’t met, senses (hearing, seeing, feeling, smelling, touch, whatever else), Languages (beings that can’t hear won’t use speech), speed of thinking, limits of percecption and imagination, memory, lifestages, can they die of old age (there are animals in this world who don’t), maximum age, resistence against exposure and other ills, count and kinds of limbs, what do they use to manipulate their environment
History and Political Landscape
Climate changes, wars, epedemies, catastrophies, displaced populations (for example through said climate changes), religions and their relationship to science and politics, governments, legal forms and social systems (e.g. feudalismn etc.), definition of ownership and wealth (Land? Herds? Hunting rights? A thickly padded bank account?), currencies, heirs, social strata (eg. peasants vs. aristocracy), official approved history vs what really happened, propaganda, organization of populance (states, tribes, cities?), treatment of neighboring populations, hostilites, common conflicts, treatment of criminals, definition of crime, importance of trade and its routes, technological level, communications and travel of informations
Social Behavior and Attitudes
Gender roles, Class Roles, superstitions, beliefes, folklore, style and times of worship, art, objects of luxury, common objects and sides, legends, arts, music (if applicable), ammount of leisure time and how they spent it, dialects, customs, manners (as in greetings, farewells, formalities), Rites (birth, coming-of-age, funerals), treatment of children and the elderly, treatment of the infirm, treatment of people who do not meet social expectations, family units, approach to creating said family units, treatment of sex and love, informal trades
The Supernatural (if appliciable)
Supernatural occurrences, Mythological Beings & Deities and their influence on people, legends, results of worship, interaction with “mortal” populance, general disposition of these beings.