das Rekordhoch
record high
The highest level or value ever reached, especially for stock prices, temperatures, or other measurable quantities.
Der Aktienindex erreichte heute ein neues Rekordhoch.
The stock index reached a new record high today.

record high
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record high
The highest level or value ever reached, especially for stock prices, temperatures, or other measurable quantities.
Der Aktienindex erreichte heute ein neues Rekordhoch.
The stock index reached a new record high today.

The word is a compound of 'Rekord' (record) and 'hoch' (high). It literally describes a high value that represents a new record.
Die Besucherzahlen des Museums haben in diesem Sommer ein Rekordhoch erreicht.
The museum's visitor numbers reached a record high this summer.
'Rekordhoch' (record high) is very frequently used with the verb 'erreichen' (to reach). The verbs 'verzeichnen' (to record) and 'markieren' (to mark) are also common in this context, especially in news or reports.
Die Ölpreise erreichten gestern ein neues Rekordhoch.
Oil prices reached a new record high yesterday.
This word is mainly used in contexts where measurable data plays a role. You hear it especially often in the news in relation to stock prices, economic data, or weather phenomena such as temperatures.
Die Temperaturen kletterten auf ein Rekordhoch für den Monat April.
Temperatures climbed to a record high for the month of April.
maximum
'Maximum' and 'Rekordhoch' can both refer to the highest value of something. 'Maximum' is more general: it means the greatest possible or allowed value, even if there is no comparison with the past. 'Rekordhoch' is used when a value is higher than ever before measured or reached. This is typical for temperatures, prices, or stock market prices. Learners may confuse the words because both sound like 'very high'. Remember: 'Maximum' is the upper limit, while 'Rekordhoch' is a new or highest-ever record.

Die Temperaturen erreichen heute ein Rekordhoch für diesen Monat.
Temperatures are reaching a record high for this month today.
In den kleinen Aufzug dürfen maximal sechs Personen; das ist das Maximum.
A maximum of six people are allowed in the small elevator; that is the limit.