Hannover and Hamburg are 150 km apart and share a similar north German climate – but Hamburg is wetter and windier due to North Sea proximity, with around 770 mm of annual precipitation versus Hannover's 620 mm. Hannover in turn is slightly warmer in summer and has more sunshine hours because it is further from marine influence.
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The comparison tool above stacks Hannover and Hamburg into the same time window. Pick a month from last year, a quarter from 2020, or a full summer, and both cities are scored on the same four metrics: temperature, sunshine, precipitation, and wind. Aggregation switches between day, week, and month depending on how granular you want the trace.
A side-by-side comparison surfaces differences that a single-city view hides. If Hannover and Hamburg sit in the same climate region, the gaps are small but both cities react similarly to weather patterns. If they sit further apart, coast versus inland or north versus south, regional effects show up directly in the numbers.
Both cities draw from the same dataset: the ECMWF ERA5 reanalysis archive, retrieved via the Open-Meteo archive API. Reanalysis means every available satellite and surface measurement is reconciled retrospectively and placed on a consistent grid. Values for Hannover and Hamburg are therefore directly comparable whether you look at 1970 or 2025.
The comparison is free and ad-free. Every selection sits in the URL so you can share the result as a link or embed it into your own page via the widget. If you want to go deeper, the individual city pages for Hannover and Hamburg are reachable in the block directly below.