Weather that comes from somewhere: rain you can ask the world about
Most games treat weather as a light switch. A global flag flips to raining, and rain appears over the whole map at once, the same rain everywhere, until the flag flips back. We didn’t want that.
In a game about tending one place across a very long time, the weather had to belong to the place — to come from somewhere, behave like the part of the world it falls on, and be the same the next time you stand there. This is the story of building weather you can ask the world about.
This piece is about the weather itself — the rain, the wind, the temperature, and the storms that drift across the land. The wider work of waking an empty world — teaching the terrain to age and the rivers to carve themselves — is its own story. Here we’re staying with the sky.
Three questions you can ask of any place
The whole system rests on a small, almost stubborn idea: there is no current weather sloshing around in memory. Instead, you can stand at any point on the map, at any moment in the world’s life, and ask it three plain questions — how much rain is falling here, which way and how hard is the wind blowing, and how warm is it. The world answers from two things only: the seed that makes your world the world it is, and the climate of the patch of ground under your feet.
That sounds like a technical nicety, but it’s really the thing that makes a tended world feel solid. Because the answer is derived rather than stored, the same question at the same place and time always gives the same answer. Walk away for a season, come back, and the weather you find is the weather that belongs there — not a fresh roll of the dice. A storm you saw building isn’t gone because you looked away; it was always going to happen, and it still does.
Four climates, four temperaments
The heart of the work was giving each climate its own character, so the weather reads as part of the place rather than as one generic storm wearing four coats of paint. The Long Watch has four — temperate, boreal, arid, and tropical — and each was given its own personality across rain, wind, and temperature. The goal was a difference you can feel before you can name: a desert downpour should read nothing like a boreal drizzle.
- Arid is mostly dry, and patient about it. Rain comes rarely — but when a storm does arrive it hits hard, sharp, and short, often gone again inside a day. Arid carries the biggest temperature swings of any climate, the desert’s hot days and cold nights, and the sharpest, most sudden gusts.
- Tropical is the wettest. Storms arrive often and spread wide — broad, soaking weather rather than sudden — and between them the air stays warm and calm, with the smallest temperature swing of the four. A tropical storm can settle in for days at a time.
- Boreal is the slow one. Its storms last the longest and build gradually, the wind runs steadiest and strongest, and when winter settles in, the cold goes deep enough to frost the ground. It is the climate of long, gradual weather.
- Temperate sits in the middle of all three — moderate rain, moderate wind, a moderate year. It’s the climate against which the others read as extreme.
Storms that arrive from somewhere
Under those steady temperaments sits a quieter layer of variation, so no two spots feel identical even within one climate, and on top of all of it, a schedule of storms. A storm isn’t a flag — it’s an event with a place, a size, a duration, and an intensity. It has a center somewhere on the land, and it drifts across the region you’re tending, fading softly at its edges rather than snapping on and off across the whole map at once. Weather, in other words, has somewhere it’s coming from and somewhere it’s going.
Because the storms are seeded along with everything else, they recur identically every time you load that world. The schedule isn’t hidden, either — we can walk it forward for any world, reading off the storms to come. In one example world, that worked out to fifty-nine storms spread across three in-game years: a quiet, legible weather future, the same on every replay.
The turning year, shifting all of it
A climate sets the baseline; the seasons bend it. Springs come in wetter, summers turn drier and calmer, and winters run dry, windy, and cold enough in the colder climates to bring frost. So a boreal winter isn’t just a boreal day with the temperature turned down — it’s the season and the climate compounding into something that feels like deep winter in the north. Making the year visible on screen was a separate piece of work; here it’s enough that the year quietly reaches into the weather and shifts every dial a little.
Painted to match the world, not bolted on
Weather you can ask about is only half of it; you also have to see and hear it. We were careful to paint the weather into the game’s existing golden-hour mood rather than stacking a storm filter on top. Rain falls as a drift of soft particle streaks — a pool of up to a few thousand of them — that follow the camera as you move. As rain builds, the sky eases toward overcast and the ground darkens with wetness; when it’s cold enough, the ground pales toward frost instead. All of it is tuned to read softly inside the warm palette, so even a downpour stays cozy rather than turning the screen grey and grim.
And the world found its voice in the same breath — wind and rain synthesized live, never a recorded loop, following the same weather you can see — which has its own story.
To tune all of this we gave ourselves a plain way to look at the invisible: a developer view that lays the weather over the terrain as colored grids, one reading at a time, so we could see the shape of a storm front or a temperature gradient spread across the land while we adjusted it. We first authored every value to be deliberately painterly-soft, then reviewed it by eye across every climate until each one read like itself.
We’re not deciding it’s raining. We’re asking the place what its weather is — and the same place always gives the same answer.
Why it mattered: weather is an input, not a backdrop
The deepest reason we built weather this way is that in The Long Watch it isn’t scenery — it’s a force that acts on the living world. The same rain you watch and hear is the rain that wets the soil, tints the ground wet or frosted underfoot, and, over in-game years, drives the slow carving of the terrain. The sky and the dirt are reading from one answer.
That’s exactly why it had to be a property of place and moment rather than a stored value. Because the weather depends only on the seed, the spot, and the time, every system that needs it can ask independently and always agree: ask once to draw the rain, again to wet the soil, again to wear down a riverbank, and the three answers never drift apart. It’s also what let us, later, take an expensive batch of weather questions that had started to stutter the game and spread the work across many frames without changing a single result — but that freeze is its own story. The weather stays re-tunable right up to release; what won’t change is where it comes from.
The thing we’re proudest of isn’t any one storm. It’s that the weather in your world is a true part of the place — that you can stand anywhere, at any moment, and the world will tell you honestly what the sky is doing, and tell you the same thing again the next time you ask. A world you tend is a world you can trust to be there when you return, weather and all.
