Number of days available for climatic review
| Parameter | Jan | Feb | Mär | Apr | Mai | Jun |
| Tmax | 1514 | 1357 | 1502 | 1459 | 1495 | 1460 |
| Tmin | 1508 | 1369 | 1496 | 1459 | 1495 | 1465 |
| Sonnenscheindauer | 0 | 0 | 0 | 0 | 0 | 0 |
| Niederschlag | 107 | 93 | 110 | 111 | 139 | 134 |
| Feuchte/Sicht | 79 | 67 | 70 | 67 | 80 | 105 |
| Parameter | Jul | Aug | Sep | Okt | Nov | Dez |
| Tmax | 1507 | 1504 | 1458 | 1513 | 1467 | 1509 |
| Tmin | 1507 | 1501 | 1466 | 1521 | 1476 | 1516 |
| Sonnenscheindauer | 0 | 0 | 0 | 0 | 0 | 0 |
| Niederschlag | 140 | 139 | 134 | 132 | 136 | 129 |
| Feuchte/Sicht | 111 | 113 | 107 | 107 | 105 | 115 |
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. |
Hagåtña