Number of days available for climatic review
| Παράμετρος | Ιαν | Φεβ | Μαρ | Απρ | Ιουν | Ιουλ |
| Tmax | 773 | 697 | 774 | 749 | 773 | 750 |
| Tmin | 775 | 699 | 774 | 747 | 775 | 749 |
| Διάρκεια Ηλιοφάνειας | 403 | 364 | 402 | 387 | 403 | 418 |
| Υετός | 155 | 140 | 155 | 151 | 155 | 150 |
| Υγρασία/Ορατότητα | 154 | 139 | 154 | 149 | 154 | 149 |
| Παράμετρος | Αυγ | Σεπ | Οκτ | Νοε | Δεκ | (null) |
| Tmax | 773 | 771 | 750 | 767 | 748 | 776 |
| Tmin | 772 | 774 | 749 | 765 | 747 | 776 |
| Διάρκεια Ηλιοφάνειας | 463 | 464 | 389 | 391 | 328 | 373 |
| Υετός | 155 | 157 | 152 | 154 | 150 | 155 |
| Υγρασία/Ορατότητα | 153 | 152 | 148 | 148 | 148 | 153 |
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. |
Athlone