The following are the temperatures in °C for the first 14 days of January:

7
,


−
4.5
,


−
2
,


0
,


2.5
,


1
,


−
5
,


−
0.5
,


3
,


−
5.5
,


4
,


2
,


−
3
,


4.5


What is the median temperature for those 14 days?
Give your answer as a decimal.