Abstract:

In August 2016, a meteorological station was established in Dacheng village, on the east bank of Dali Erhai lake, in order
to find the excellent astronomical observatory site in Dali. Up to September 2017, meteorological data more than one year has been
accumulated, and the wind speed, wind direction, temperature and humidity in meteorology can be preliminarily analyzed. It is
concluded that this site has distinct dry season and rainy season characteristics. Among them, the period from July to September is the
rainy season and the average humidity in each period（dawn，dusk，day，night）is over 75%. In February, the drought was the most
severe. The humidity in the day is within 70% from November to April. The humidity curve showed a significant decrease in June,
indicating that the moisture content of the period had obvious local climate anomalies. Due to the small annual average wind speed and
wind direction stability, significant seasonal periodicity and little light pollution at night, etc, a preliminary determination can be made
that the site is suitable for both teaching and scientific research for astronomical observation.

Key words: Dali, astronomical observatory site, meteorological, telescope