Site
The number of clear nights (zero cloudiness) at the Wise Observatory site is about 170 a year. The number of useful nights, with part of the night cloud-free, is about 240. The best season, when practically no clouds are observed, is June to August, while the highest chance for clouds are in the period January to April. Winds are usually moderate mainly from North-East and North. Storm wind velocities (greater than 40 km/h) occur, but rarely. The wind speed tends to decrease during the night. Temperature gradients are small and fairly moderate. The average relative humidity is quite high with a tendency to decline during the night from April to August.
The average seeing is about 2-3 seconds of arc. A few good nights have seeing of 1" or less while few show seeing larger than 5".
An important advantage of the Wise Observatory at its location of ~35°E in the Northern Hemisphere is the possibility of cooperating with observatories at other longitudes for time-series studies. Such projects involve searches for stellar oscillations within the Whole Earth Telescope project, monitoring gravitational microlensing events, combined ground and space observing campaigns, etc.
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