| OBSERVING STATISTICS FOR 1999 |
| |
| |
Clear Nights* |
Photometric Nights |
Number of Observation Hours |
Average Nocturnal Temperture (ºC) |
Average Nocturnal Wind Speed (m/s) |
| January |
20 |
12 |
208 |
0.9 |
5.7 |
| February |
18 |
11 |
201 |
-2.0 |
6.2 |
| March |
13 |
4 |
137 |
0.7 |
6.7 |
| April |
20 |
7 |
181 |
4.2 |
6.1 |
| May |
12 |
1 |
111 |
8.2 |
5.7 |
| June |
19 |
13 |
151 |
12.2 |
4.4 |
| July |
29 |
21 |
151 |
15.5 |
3.3 |
| August |
22 |
14 |
193 |
15.4 |
2.4 |
| September |
17 |
8 |
178 |
9.9 |
5.2 |
| October |
5 |
2 |
69 |
7.9 |
6.9 |
| November |
14 |
11 |
159 |
- |
- |
| |
| Total number of clear nights from 1.Jan until 30.Nov 1999: 189 |
| *A clear night is when the sky is 70% clear for more than 6 hours |
| Comments and suggestions to H. Frahm (frahm@caha.es) |
