Number of days available for climatic review
| Parámetro | ene | feb | mar | abr | may | jun |
| Tmáx | 521 | 438 | 479 | 475 | 481 | 476 |
| Tmín | 387 | 345 | 380 | 361 | 384 | 378 |
| Duración del tiempo soleado | 124 | 198 | 186 | 210 | 217 | 180 |
| Precipitación | 177 | 163 | 174 | 173 | 178 | 170 |
| Humedad/Visibilidad | 118 | 105 | 110 | 103 | 99 | 89 |
| Parámetro | jul | ago | sep | oct | nov | dic |
| Tmáx | 485 | 485 | 496 | 481 | 447 | 464 |
| Tmín | 387 | 385 | 383 | 404 | 371 | 378 |
| Duración del tiempo soleado | 186 | 248 | 210 | 155 | 120 | 155 |
| Precipitación | 179 | 177 | 196 | 182 | 169 | 167 |
| Humedad/Visibilidad | 111 | 112 | 125 | 109 | 122 | 131 |
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. |
Biratnagar