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| Tmin: any | Tmax: any |
| Sunshine: any | Rain: any |
| USA | January |
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| City | Tmin | Tmax | Sunshine | Rain |
| [°C] | [°C] | [hrs] | [days] | |
| 6 | 16 | n/a | 12 | |
| -5 | 3 | n/a | 20 | |
| -9 | 1 | 5 | 12 | |
| -8 | -1 | 3 | 26 | |
| -5 | 11 | n/a | 7 | |
| -17 | -6 | 5 | 18 | |
| -4 | 2 | 5 | 17 | |
| -4 | 2 | 5 | 18 | |
| -4 | 2 | n/a | 18 | |
| 10 | 21 | 3 | 14 |
| | | | | | | | |
USA - Brownsville
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. |
