This photo shows the solar equivalent of a 22-degree halo around the moon due to light refraction from very thin high clouds being cirrostratus nebulosus as an approaching low pressure system from the west directed a SW current towards the Maltese Islands. The halo was quite impressive given that it occured in a waxing gibbous moon rather than full moon when halos are more easily photographed. Halo usually indicates the imminent arrival of bad weather which had occured more than 12 hours later after the cold front on the shown surface pressure passed over Malta. Note that lunar halos are rare compared to solar ones because moonlight is much weaker than light from the sun and this phenomena could only occur for a few days every 4 weeks around a full moon given the right atmospheric conditions.