About 0.6°F per decade, measured from Langenfeld's official daily weather records, 1971–2025. Individual years still bounce around — some recent ones came in cool — but the long-term line has clearly risen.
Is that a lot? Langenfeld's warming is broadly in line with other cities in Germany — neither unusually fast nor unusually slow.
What has actually changed
Each card compares the 1970s (the first ten years of the
record) with recent years (the last ten) — the same span
the headline and the chart use.
Freezing nights
5 fewer nights
1970s
59 / yr
→
Recent
54 / yr
Milder winters — fewer frosts
Average temperature
+2.4°F
1970s
50.4°F
→
Recent
52.8°F
A steady upward drift
Hot days above 90°F
3 more days
1970s
3 / yr
→
Recent
6 / yr
More days of serious heat
Rainy days
13 fewer days
1970s
182 / yr
→
Recent
169 / yr
Drier on average
Langenfeld's temperature, year by year
Average temperature for each year from 1971 to 2025.
a warmer-than-average year a cooler-than-average year
Each bar is one year. Most recent years sit above the older ones.
Some recent years still came in cool — warming is a slope,
not a straight climb.
When in the year the change shows up
How much warmer each month is now than in the 1970s.
Useful if you garden or care about a particular season —
otherwise the headline above already has the answer.
April has warmed the most — about 1.9°F. The warming runs across the whole year, not just one season.
Methodology & sources
Temperature — 1991–2020 normals computed from 30 years of daily observations at Dusseldorf, a weather station, about 24 km from the city centre. The underlying daily records come from NOAA's global station network.