Number of days available for climatic review
| Parametro | Gen | Feb | Mar | Apr | Mag | Giu |
| Tmax | 84 | 85 | 89 | 81 | 88 | 89 |
| Tmin | 0 | 3 | 1 | 0 | 0 | 1 |
| Durata del soleggiamento | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitazione | 139 | 124 | 129 | 123 | 130 | 129 |
| Umidità/Visibilità | 75 | 77 | 91 | 75 | 84 | 85 |
| Parametro | Lug | Ago | Set | Ott | Nov | Dic |
| Tmax | 82 | 88 | 75 | 78 | 67 | 69 |
| Tmin | 0 | 0 | 0 | 1 | 2 | 1 |
| Durata del soleggiamento | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitazione | 132 | 136 | 117 | 127 | 132 | 134 |
| Umidità/Visibilità | 76 | 79 | 72 | 76 | 65 | 64 |
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. |
Anurādhapura