〜ほど〜ない
not as … as
A は B ほど + negative
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ほど with a negative says something doesn't reach a level: 今年の夏は去年ほど暑くない, "this summer isn't as hot as last year". A is compared with B and falls short.
What comes after ほど must be negative. For positive comparisons, use より: 去年より暑い, "hotter than last year".
It works with verbs too: 思ったほど難しくなかった, "it wasn't as hard as I thought", a very common phrase with 思った.
A related pattern, 〜ほど〜はない, means "there's nothing as … as": 家ほど落ち着く所はない, "nowhere is as relaxing as home". It's a strong way to say something is the best.
Examples
今年の夏は去年ほど暑くない。
This summer isn't as hot as last year.
テストは思ったほど難しくなかった。
The test wasn't as hard as I thought.
私の町は東京ほど大きくありません。
My town isn't as big as Tokyo.
兄は父ほど背が高くない。
My older brother isn't as tall as my father.
今日は昨日ほど寒くないですね。
Today isn't as cold as yesterday, is it?
家ほど落ち着く所はない。
Nowhere is as relaxing as home.