Interface SeasonOptions

Starting phase, 0–1 with 0 = midwinter and 0.5 = midsummer. Default 0.25 (spring).

Whether the map spans a range of climates or sits inside one. Default 'continental'. See SeasonScope — this picks which set of options below has any effect.

Days in a year — how many day/night cycles the phase takes to come around. Default 8.

Real seconds per day, matching DayNightOptions.dayLength, for SeasonCycle.advance. Default 120.

Start with the phase frozen (drive it via setPhase). Default false.

How far midwinter drags the temperature down at the poles, in temperature-field units (the same 0–1 scale computeTemperature writes). Default 0.55.

The same swing at the equator. Much smaller than polarAmplitude on purpose — that gap is what makes the snowline descend the map through autumn rather than the whole world fading white at once. Default 0.08.

Which map edge is the equator. Must match the map's TemperatureModelOptions. Default 'both'.

Local scope: the temperature the whole map sits at in high summer. Wants to be clear of the foliage tint's greenTemp (0.5) so midsummer is unambiguous everywhere. Default 0.78.

Local scope: how far midwinter pulls that down. Wants to carry the map past every threshold that matters — bareTemp (0.26), snowThreshold (0.22), water's freezePoint (0.12) — or winter never fully arrives. Default 0.72.

Local scope: how much the map's own temperature field staggers the turn, so the whole map doesn't flip on one frame. The field is reused as the stagger rather than as the climate — scaled this far down, its latitude ramp reads as a few cells turning first, and its elevation cooling as the high ground leading, which is exactly the variation a valley should show.

Deliberately small: the stagger has to be narrower than the swing, or the promise that a hard winter strips every tree stops holding. Default 0.1.

Effective temperature at or below which snow lies. Default 0.22.

Width of the soft edge on the snow threshold. Larger = a hazier snowline. Default 0.1.

Snow depth gained per second when SeasonCycle.apply is given a dt. Default 0.35.

Snow depth lost per second when melting. Faster than it falls, as thaws go. Default 0.5.