Summer day
Temperature & humidity
In German weather statistics, a summer day has a maximum air temperature of at least 25 °C. The calendar month does not determine the classification.
The calendar does not decide
A day counts as a summer day if its measured maximum reaches 25.0 °C or more. A warm April day can qualify, while a rainy July day reaching only 19 °C does not. The calendar is welcome to disagree.
What the definition does not require
- Temperature need not stay above 25 °C all day.
- The weather need not be sunny or dry.
- A maximum of at least 30 °C also makes it a hot day.
Summer days in climate records
The record counts all days when the maximum temperature reaches the threshold. Hot days are already included and must not be added again. Long-term averages may have decimal places; an individual day counts as a whole day.
In Hanover
Hannover’s summer days in the records
The DWD station Hannover averaged 36.0 summer days per year during 1991–2020. July averaged 11.7 and August 10.6. Hot days are already included in these totals and must not be added again.
These are long-term averages for the station. An individual summer can have more or fewer qualifying days. Whether one feels pleasant also depends on wind, humidity, sunshine and the person experiencing it.