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| Tmin: any | Tmax: any |
| Sunshine: any | Rain: any |
| USA | January |
Search list: 225 Stations -
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| City | Tmin | Tmax | Sunshine | Rain |
| [°C] | [°C] | [hrs] | [days] | |
| -7 | -1 | 2 | 25 | |
| 1 | 12 | 4 | 10 | |
| -6 | 1 | n/a | 13 | |
| -12 | -4 | 4 | 18 | |
| -1 | 8 | 4 | 13 | |
| 0 | 10 | 5 | 11 | |
| -7 | 1 | 4 | 18 | |
| -14 | -3 | n/a | 13 | |
| -11 | 0 | 4 | 14 | |
| 17 | 26 | 5 | 15 |
| | | | | | | | |
USA - Helena
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. |
