Weather & Sky — 雨/日/风/云

A radical tour of the atmospheric namespace

The sky is a surprisingly well-typed namespace. Chinese carves it up with four radicals, and once you know them the whole weather report parses itself. If something falls out of the sky, it probably carries 雨 on top. If it involves sunlight or warmth, it carries 日 on the side. Wind has its own standalone glyph, 风, that doubles as a classifier. Clouds — 云 — are a small family but they show up in every overcast afternoon.

The payoff: weather vocabulary in Chinese is not a list of unrelated words. It is a tiny type hierarchy. Snow, thunder, fog, frost, dew, and hail are all subclasses of Rain. Sunny, warm, and dark are all methods on the Sun interface. Learn four radicals, get twenty words for free.

// The atmospheric namespace, imported piece by piece.
import { rain, snow, thunder, fog, frost } from "雨";   // precipitation factory
import { sunny, warm, dark, bright }       from "日";   // sun & daylight
import { wind, typhoon, fan, hurricane }   from "风";   // air-in-motion
import { cloud, overcast }                  from "云";   // suspended water
import { sky, day, weather }               from "天";   // the domain itself

1. The radical map

Four radicals, the whole atmosphere. Anchor links jump to each section below.

6. Weather states, temperature, seasons

With the radicals in place, describing the weather is mostly composition. The patterns reduce to three:

• verb + object for events: 下雨 (rain falls), 刮风 (wind blows).
• adjective + 天 for the day's label: 晴天, 阴天, 雨天.
• 很 + adjective for temperature: 很冷, 很热, 很暖.

Temperature adjectives

Notice the symmetry: 冷/热 are the blunt poles; 凉/暖 are the pleasant interior. 潮湿 carries 氵 (water) twice — moisture, announced twice. 干燥 carries 火 in 燥 — dryness as the absence of water, the presence of heat.

Seasons

The calendar is stored in the characters: spring carries 日, autumn carries 禾 and 火, winter carries 冫.

7. Aspect particles and weather

Weather is where aspect particles earn their keep. A verb like 下雨 doesn't conjugate for tense — it uses particles to mark whether the event is starting, ongoing, or already done. Three particles do most of the work: 了, 在, and 过.

These three patterns compose cleanly with every weather verb: 下雪了 / 在下雪 / 下过雪, 刮风了 / 在刮风 / 刮过风. Learn the slots once, substitute the weather freely. See the aspect particles flowchart for the full decision tree.

8. Putting it together

Small-talk scaffolding, built from the radicals above:

9. Sentence patterns

Five sentences you can build right now. They cover the three aspect patterns plus the modal 会 (will / predicts future).

// 今天 天气 很 好。
// jīntiān tiānqì hěn hǎo
// "The weather is nice today." (topic-comment, no verb "to be")
today.weather === "good";

// 外面 在 下雨。
// wàimiàn zài xià yǔ
// "It's raining outside." (在 = in-progress aspect)
outside.isRaining === true;  // in progress: 在

// 昨天 下 了 雪。
// zuótiān xià le xuě
// "It snowed yesterday." (了 = completed aspect)
yesterday.snowed();  // completed: 了

// 明天 会 很 热。
// míngtiān huì hěn rè
// "It'll be hot tomorrow." (会 = modal "will")
tomorrow.temperature === "hot";  // predicted: 会

// 北京 的 冬天 很 冷。
// Běijīng de dōngtiān hěn lěng
// "Beijing winters are cold." (的 = descriptive glue)
beijing.winter.temperature === "cold";

The grammar is fussily regular. Weather events go verb-first (下雨, 刮风). Weather states go topic-first (天气 很 好). Temperature is an adjective stapled onto a day or a place. Once you stop looking for verb conjugation — there isn't any — the whole thing parses.

10. Next steps

• Browse weather & sky vocabulary — filtered by tag
• Start a review session — lock in the 雨 family first
• Aspect particles flowchart — 了 / 在 / 过 decision tree
• Food & Eating — more radical-family tours
• Module 4: Composition — the full theory of radicals

Weather is a small, self-contained namespace — four radicals, about twenty-five words. A good first domain to learn as a system rather than a list. The same compositional move works for the home, the body, food, and time.