Number of days available for climatic review
| Parametro | Gen | Feb | Mar | Apr | Mag | Giu |
| Tmax | 264 | 249 | 272 | 242 | 267 | 238 |
| Tmin | 259 | 253 | 281 | 252 | 276 | 260 |
| Durata del soleggiamento | 72 | 76 | 85 | 67 | 78 | 69 |
| Precipitazione | 115 | 122 | 154 | 159 | 157 | 145 |
| Umidità/Visibilità | 70 | 73 | 77 | 56 | 66 | 55 |
| Parametro | Lug | Ago | Set | Ott | Nov | Dic |
| Tmax | 248 | 254 | 271 | 289 | 252 | 275 |
| Tmin | 268 | 255 | 268 | 280 | 262 | 274 |
| Durata del soleggiamento | 76 | 66 | 74 | 88 | 78 | 83 |
| Precipitazione | 169 | 169 | 157 | 155 | 153 | 159 |
| Umidità/Visibilità | 63 | 62 | 75 | 84 | 61 | 71 |
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. |
Brazzaville