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| Tmin: any | Tmax: any |
| Sunshine: any | Rain: any |
| Europe | January |
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| City | Tmin | Tmax | Sunshine | Rain |
| [°C] | [°C] | [hrs] | [days] | |
| 0 | 5 | 2 | n/a | |
| -1 | 2 | n/a | 21 | |
| -1 | 3 | n/a | 24 | |
| -15 | -10 | n/a | 25 | |
| 2 | 6 | 2 | 20 | |
| 0 | 5 | 2 | 22 | |
| 2 | n/a | n/a | 20 | |
| -1 | n/a | n/a | 19 | |
| 2 | 8 | n/a | 17 | |
| -2 | 4 | 3 | 10 |
| | | | | | | | |
Germany - Aachen
Number of days available for climatic review
Climate data is usually derived from meteorological data of a certain number of years. The actual number of recorded years may vary from only a couple to 50 years or more. The quality of climate data depends on the number of available recorded years. Fewer years means less reliable data. The standart-period for reliable climate data is 30 years. For example, the mean monthly temperature for, let's say January, would ideally calculated from a total number of 930 recorded January-days. However, the usual number of recorded days is much smaller. The table above shows the actual number of recorded days for every parameter measured. |
