
ansteigen
to rise
To increase; to go up in quantity, value, or degree.
Die Temperaturen sollen am Wochenende auf über 30 Grad ansteigen.
Temperatures are expected to rise to over 30 degrees on the weekend.
to rise
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to rise
To increase; to go up in quantity, value, or degree.
Die Temperaturen sollen am Wochenende auf über 30 Grad ansteigen.
Temperatures are expected to rise to over 30 degrees on the weekend.

to slope upward
To have an incline; to lead upward.
Der Weg zum Gipfel steigt hier sehr steil an.
The path to the summit slopes upward very steeply here.
'Ansteigen' (to rise) is a separable verb. The prefix 'an-' stands at the end in main clauses; in subordinate clauses and in the infinitive, it remains attached to the verb.
Die Zahl der Arbeitslosen steigt weiter an.
The number of unemployed people continues to rise.
The perfect tense of 'ansteigen' (to rise) is always formed with the auxiliary verb 'sein' (to be), because it describes a change of state or level.
Die Kriminalitätsrate ist im letzten Jahr stark angestiegen.
The crime rate rose sharply last year.
To specify the increase more precisely, use 'auf' + accusative for the new value and 'um' + accusative for the difference.
Das Thermometer ist auf 10 Grad angestiegen.
The thermometer rose to 10 degrees.
When the subject is something abstract (e.g., prices, fever, numbers), the meaning is 'zunehmen' (to increase). When the subject is something physical that can be walked on (e.g., path, road, terrain), the meaning is 'nach oben führen' (to lead upward).
Die Nachfrage nach Elektroautos steigt stetig an.
Demand for electric cars is steadily rising.
to climb
Klettern and ansteigen can both indicate that a measurable value is increasing. Ansteigen describes this development neutrally, while klettern presents the rise figuratively and often makes it seem somewhat more noticeable. Ansteigen is usually more suitable in factual reports, while klettern can also be used in emphatic or journalistic writing.

Die Preise für Lebensmittel steigen diesen Monat erneut an.
Food prices are rising again this month.
Die Preise für Lebensmittel klettern diesen Monat erneut.
Food prices are climbing again this month.