He said the level had dropped because of low precipitation levels over the last three years.

Ongoing and future changes could bring higher precipitation levels back to the region.

The precipitation levels are really what distinguish the two cities.

And precipitation levels for the summer are about an inch-and-a-half above normal.

The table below shows temperature and precipitation levels for 1971-2000 :

Precipitation levels vary greatly within the island, with the east being much wetter than the west.

Precipitation levels are so low (only about 25 to 200 mm per year, all as snow) that it is called a polar desert.

Yeheb can cope with minimal precipitation levels of 150 - 200mm/year.

The entire process was accompanied by other environmental swings - in precipitation, ocean levels and lake sizes.

Precipitation levels are low, but precipitation can be observed throughout the year.