这张专为天文观测绘制的夜空图可以一览温哥华两天内与星空、极光观赏相关的天气条件。
红色竖线为零点分界线。上部分是当地日期和时间。中间部分为云量、空气透明度、 视宁 度和黑暗度。下部分为风速、湿度和气温。
颜色按黑至白分为若干等级,代表从极好到极差的状况。颜色越深,条件越好。
温哥华周边其它地点夜空气候图(自西向东、自北向南):
Sunshine coast |
Salt Spring |
Victoria |
Whistler |
Squamish |
Vancouver |
Boundary Bay |
Burnaby Mountain |
Pitt River |
Stave Lake |
McDonald Park |
Mt. Baker |
Hope Slide |
Merritt |
Manning Park |
图示说明
云覆盖量(Cloud Cover)
100% | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% | 0% |
空气透明度(Transparency )
多云 | 差 | 较差 | 一般 | 较好 | 极好 |
在无云的条件下,空气中的水汽密度也会影响空气透明度。
视宁度 (Seeing )
多云 | 很差1/5 | 差 2/5 | 一般 3/5 | 好 4/5 | 极好 5/5 |
因为温度不同造成空气密度不同形成扰流,严重时导致观察行星时出现闪烁和模糊,而对于银河的观赏则影响不大。
黑暗度 ( 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 |
影响黑暗度的因素是日光(暮光、曙光)和月光。
风速(Wind,单位:公里/小时)
>72 | 46 to 72 | 28 to 45 | 19 to 27 | 9 to 18 | 0 to 8 |
湿度(Humidity )
<25% | 25% to 30% | 30% to 35% | 35% to 40% | 40% to 45% | 45% to 50% | 50% to 55% | 55% to 60% | 60% to 65% | 65% to 70% | 70% to 75% | 75% to 80% | 80% to 85% | 85% to 90% | 90% to 95% | 95% to 100% |
温度(Temperature,单位: °C )
< -40 | -40 to -35 | -35 to -30 | -30 to -25 | -25 to -20 | -20 to -15 | -15 to -10 | -10 to -5 | -5 to 0 | 0 to 5 | 5 to 10 | 10 to 15 | 15 to 20 | 20 to 25 | 25 to 30 | 30 to 35 | 35 to 40 | 40 to 45 | > 45 |