天気が悪いときは山登りは危険だ。

天気が悪いときは山登りは危険だ。

It's dangerous to climb a mountain in bad weather.

天気(てんき)が悪(わる)いときは山登(やまのぼ)りは危険(きけん)だ。

Tenki ga warui toki wa yamanobori wa kiken da.

天気 (てんき)

weather; the elements; fair weather; fine weather

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

悪い (わるい)

bad; poor; inferior; evil; sinful; unprofitable; unbeneficial; at fault; to blame; in the wrong; sorry

とき (とき)

regular (stops at every station) Jouetsu-line Shinkansen

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

山登り (やまのぼり)

mountain climbing; mountaineering

危険 (きけん)

danger; peril; hazard; risk

だ (だ)

be; is; indicates past or completed action; indicates light imperative

Readings: テン、あまつ、あめ、あま-

Meanings: heavens, sky, imperial

Readings: キ、ケ、いき

Meanings: spirit, mind, air, atmosphere, mood

Readings: アク、オ、わる.い、わる-、あ.し、にく.い、 -にく.い、ああ、いずくに、いずくんぞ、にく.む

Meanings: bad, vice, rascal, false, evil, wrong

Readings: サン、セン、やま

Meaning: mountain

Readings: トウ、ト、ドウ、ショウ、チョウ、のぼ.る、あ.がる

Meanings: ascend, climb up

Readings: キ、あぶ.ない、あや.うい、あや.ぶむ

Meanings: dangerous, fear, uneasy

Readings: ケン、けわ.しい

Meanings: precipitous, inaccessible place, impregnable position, steep place, sharp eyes