1.   An ice age begins slowly, almost imperceptibly, when the average temperature drops by a few degrees.

2.   At night the temperature drops below zero.

3.   Fortunately the temperature never dropped low enough to freeze the pipes.

4.   The wind was howling and the temperature was dropping fast.

5.   When the temperature drops they become dormant but remain alive.

6.   Temperatures can drop to freezing at night.

7.   When all the liquid has solidified, the temperature drops once again.

8.   In winter, the temperature can drop to minus forty degrees centigrade.

9.   The temperature drops sharply at night.

10.   Some icy patches are likely on roads as temperatures drop as minus two Celsius, twenty eight Fahrenheit.