Heidelberg Temperature & Trend Analysis

This dashboard provides a clear, quantitative look at the temperature development in Heidelberg. Over the last 150+ years, the region has experienced an undeniable shift in its temperature baseline.

Historically, Heidelberg's position in the Upper Rhine Plain and the Neckar valley has given it a relatively warm and sheltered climate compared to other regions in Germany. However, anthropogenic warming has dramatically amplified this. While the warming trend since 1871 is +0.15°C per decade, this rate has accelerated to +0.20°C per decade over the last 100 years.

This warming is reflected in a shift of seasonal averages: modern winters (2021–2025) are now warmer than historical winters, and modern summers are breaking records. The number of annual "Hot Days" (maximum temperature ≥ 30°C) has surged from a decadal average of under 5 days in the early 20th century to over 20 days in recent years, while "Frost Days" (minimum temperature < 0°C) continue to decline.