昨日は寒かったが、今日は更にいっそう寒い。

It was cold yesterday, but it is still colder today.

昨日(きのう)は寒(さむ)かったが、今日(きょう)は更(さら)にいっそう寒(さむ)い。

Kinō wa samukatta ga, kyō wa sarani issō samui.

昨日 (きのう、さくじつ)

yesterday

は (は)

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

寒い (さむい、さぶい)

cold (e.g. weather); uninteresting (esp. joke); lame; dull; weak; corny

が (が)

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

今日 (きょう、こんにち、こんち、こんじつ)

today; this day; these days; recently; nowadays

更に (さらに)

furthermore; again; after all; more and more; moreover; even more

一層 (いっそう)

much more; still more; all the more; more than ever; single layer (or storey, etc.); rather; sooner; preferably

Reading: サク

Meanings: yesterday, previous

Readings: ニチ、ジツ、ひ、 -び、 -か

Meanings: day, sun, Japan, counter for days

Readings: カン、さむ.い

Meaning: cold

Readings: コン、キン、いま

Meaning: now

Readings: コウ、さら、さら.に、ふ.ける、ふ.かす

Meanings: grow late, night watch, sit up late, of course, renew, renovate, again, more and more, further