温度計は１５度だった。

温度計は１５度だった。

The thermometer stood at 15 degrees.

温度計(おんどけい)は１５度(ど)だった。

Ondokei wa ichi go do datta.

温度計 (おんどけい)

thermometer

は (は)

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

一 (いち)

one; best; first; foremost; beginning; start; bottom string (on a shamisen, etc.)

五 (ご、いつ、い)

five

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: オン、あたた.か、あたた.かい、あたた.まる、あたた.める、ぬく

Meaning: warm

Readings: ド、ト、タク、たび、 -た.い

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

Readings: ケイ、はか.る、はか.らう

Meanings: plot, plan, scheme, measure