今朝は零下３度だった。

今朝は零下３度だった。

The thermometer stood at three degrees below zero this morning.

今朝(けさ)は零下(れいか)３度(ど)だった。

Kesa wa reika san do datta.

今朝 (けさ、こんちょう)

this morning

は (は)

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

零下 (れいか)

below zero; sub-zero

三 (さん、み)

three; tri-

度 (ど)

degree (angle, temperature, scale, etc.); counter for occurrences and times; strength (of alcohol)

だ (だ)

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

Readings: コン、キン、いま

Meaning: now

Readings: チョウ、あさ

Meanings: morning, dynasty, regime, epoch, period, (North) Korea

Readings: レイ、ぜろ、こぼ.す、こぼ.れる

Meanings: zero, spill, overflow, nothing, cipher

Readings: カ、ゲ、した、しも、もと、さ.げる、さ.がる、くだ.る、くだ.り、くだ.す、 -くだ.す、くだ.さる、お.ろす、お.りる

Meanings: below, down, descend, give, low, inferior

Readings: ド、ト、タク、たび、 -た.い

Meanings: degrees, occurrence, time, counter for occurrences, consider, attitude