In this region, midday desert temperatures can be hot year round.
After sunset, however, the clear, dry air permits rapid loss of heat, and the nights are cool to chilly.
Enormous daily ranges in temperature are recorded.
The highest official temperature was 50.6 °C (123.1 °F) at In Salah.
Rainfall is fairly abundant along the coastal part of the Tell Atlas,
ranging from 400 to 670 mm (15.7 to 26.4 in) annually, the amount of precipitation increasing from west to east.
Precipitation is heaviest in the northern part of eastern Algeria, where it reaches as much as 1,000 mm (39.4 in) in some years.