| Cloud Cover |
| Overcast | 90% covered | 80% covered | 60% covered | 50% covered | 30% covered | 20% covered | Clear |
|
| Transparency |
| Poor | Below Average | Average | Above average | Transparent |
|
| Seeing |
| Bad 1/5 | Poor 2/5 | Average 3/5 | Good 4/5 | Excellent 5/5 |
|
| Darkness |
| -4 | -3 | -2 | -1 | 0 | 1.0 | 2.0 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 | 5.2 | 5.4 | 5.6 | 5.8 | 6.0 |
|
| Wind |
| Storm | Strong | Moderate | Light to Moderate | Light | Calm |
|
| Humidity |
| <30% |
35% |
40% |
45% |
50% |
55% |
60% |
65% |
70% |
75% |
80% |
85% |
90% |
95% |
>95% |
|
| Temperature |
| Ha! |
-30F |
-20F |
-15F |
-5F |
5F |
15F |
25F |
32F |
40F |
50F |
60F |
70F |
75F |
85F |
95F |
100F |
|
