Darwin sea level pressures (studies related to El Nino and the SOI)
Monthly values of the Darwin SLP series, from 1882 to 1998.
http://www.stat.duke.edu/data-sets/mw/ts_data/darwin.slp
This series is a key indicator of climatological patterns and has been used 
in a range of studies related to El Nino and the SOI. 

6.4
6.3
7.5
8.5
9.4
12.3
13.1
13.2
11.8
9.4
9.5
5.8
7.3
6.6
9.2
8.4
10.5
12.4
13
11.7
11.9
10.2
7.2
6.9
7.3
7.6
7.5
11
11.2
12.4
13.2
12.6
12
10.9
9
7.4
7.3
6.4
8.4
10.5
12.7
13.4
14.1
13.2
13.1
12.6
11.1
7
7.9
5.8
8.4
9.3
10.3
12.3
11.7
11.1
10.7
9.7
8.1
4.4
5.6
4.8
7.1
8.6
10.8
12.5
13.6
12.6
12.1
11
9.4
8
5.5
6.9
9.7
10.4
11.2
13.1
13.7
13.4
12.6
12
9.9
8.8
9
8.4
10.2
10.1
11.1
11.1
12.8
13
10.9
10.2
5.8
4.4
4.1
6.3
6.8
8.6
10.8
11.3
12.6
12.2
10.6
9.7
9.2
7.5
5.3
6.8
9.2
10
12.2
13.1
14.2
14.7
13.7
11.4
10.1
8.9
6.5
8.1
5.9
9.8
11.7
11.9
13
12.2
11.2
9.2
8
7.2
5.7
5.6
8.8
9.1
11.1
11.8
12.2
13
11.6
9.6
8.6
7.8
3.5
6.1
7.5
9.4
11.7
12.7
13.8
12.4
12
10.8
9
7.7
5.5
7.1
8.4
10
12.2
12.8
12.9
12.6
11.7
10.8
10.8
7.7
6.2
6.2
7.8
9.2
13.7
13.3
13.5
14.8
13.6
12.9
10.1
9.6
7.6
7.3
9.8
10.8
12.7
12.6
13.7
13
11.7
10.7
9.1
5.7
6.1
5.2
4
9.2
11.5
12.1
13.1
12.5
10.7
9.6
6.9
6.2
5.5
7.3
6.2
9.3
11.4
13
13.5
12.8
12.5
11.8
9.8
8.1
7.7
8.1
9.9
10.8
11.5
12
12.1
11.2
11.4
10.6
9.1
8.4
6.5
6.8
7.4
9.8
11.5
12.2
13.2
13.1
12.8
10.5
9.9
7.4
5.8
8.1
8.1
10.3
12.8
13.1
14
13.4
13.4
12.2
10.9
8.4
8.1
8.6
5.9
9
11
12.8
11.6
12.8
11.2
10
8.4
5.4
5.9
5.5
7.1
7.6
10.8
13.3
13.3
13.2
12
9.9
10.1
7.9
7.7
7.9
10.7
10.7
11.1
12.7
13.7
13.6
11.8
10.3
10.8
8.6
6.5
7.2
8.6
10
11.1
12.1
12
12.5
10.5
9.8
7.2
6.8
5
6.2
8
9.8
11.4
11.6
12.4
12.8
12.1
10.6
8.7
5.9
7.7
5.6
7.3
8.1
11.2
12.9
13
12.4
11.7
10.2
8.4
6.9
5.6
7.6
5.8
9.7
10.5
11.6
12.1
11.9
11.2
9.6
8.3
6.7
4.4
5
6.8
8.2
11.1
11.1
11.8
11.8
10.6
10.6
7.1
5.7
5.5
5.6
7.8
8.6
11.8
14
13.5
13.4
12.1
12
9.9
7.6
7.6
9
8.1
11.7
12.4
12.4
12
13.3
11.2
11
8.8
8.6
6
7
6.9
9.6
12.4
13.3
13.9
13
13.3
11.9
10.1
8.1
8.5
8.5
7.5
10.3
11.1
13.4
14.4
14.7
13.4
13.4
10.7
8.6
8.6
7.7
10.6
11.3
11.7
11.7
12
12.6
10.5
9.9
8.5
5.4
5.2
5.9
7.6
9.8
9.9
10.4
11.2
12.3
10.8
9
7.7
4.2
6.1
7.3
5.8
8.5
10.5
11.1
11
10.9
10.4
9.7
7.4
5.1
5.5
5.4
8.9
9
10.7
12.4
14
13.5
14.1
11.2
9.2
8
7.2
8.8
8.5
9.4
10.9
12.9
13.2
13.7
12.3
11.2
9.8
8.1
5.1
6.9
8.9
8.9
10.8
10.2
11.2
12
11
10.2
8.4
5.5
4.9
6.5
6.7
10
10
10.6
12.1
13.1
12
10.4
8.9
6.2
5.5
5.1
6.8
9.4
10.6
11.6
12.6
12.9
11.5
10.6
8.7
6.2
5.1
6.5
6.4
8.1
10.2
11.6
13.9
14.6
12.4
11.4
9.5
7
7.4
6.8
7.3
9.4
10.5
12.3
13.2
12.8
12
9.5
8
5.8
5.4
3.9
5.2
7.9
10.5
12.1
13.9
12.8
12.8
11.6
10.3
8.3
6.5
8.5
9.4
10.2
11.1
12.8
12.9
12.9
11.4
9.8
9.5
6.5
5.1
6.9
6.8
8.6
10.7
11.8
12.4
13.3
12.4
11.2
9.5
7.1
8.3
5.8
6.5
9
11.9
12.8
12.7
13.2
11.7
9.3
9.6
6.3
3.1
4.3
7.4
9.5
11.9
13.4
13.7
13.2
12.5
10.8
8
6.3
4.8
6.6
8.2
10
12
12.9
13.5
13.6
13.2
11.7
10.8
7.9
6.3
8.3
8.6
9.4
11.4
12.7
13.2
12.5
11.2
11.4
8.9
6.8
5.3
7.4
7.9
10.2
11
12.5
13.5
13.5
11.7
10.2
9
6.4
6.8
5.5
6.7
9.5
11.2
12.5
13
13.3
11.7
9.8
8.1
6.4
5.9
7.3
7
8.8
11.4
11.7
12.5
13.6
12.2
10.9
8.6
7.4
5.4
7.4
6
9.4
12
12.8
12.7
13.5
10.8
9.7
9.2
8.1
6.7
6.9
7.6
9.1
10.1
12.6
12.5
12.1
11.6
10.7
9.4
6.8
5.2
7.8
6
9.2
12
12.2
13.4
12.6
12.5
10.9
8.3
6.5
5.2
5.6
8
9
9.8
11.4
11.8
11.7
11.7
10.7
7.8
6.8
4.8
5.9
6.5
9.1
11.2
12.4
12.8
11.6
13.3
11.6
9.2
9.2
5.7
6.5
8.7
10.7
12.2
14
14.3
14.1
14.1
13.8
9.6
9.9
7.8
9.7
8.7
10.6
11.2
13.7
15.4
14.5
12.7
11.9
9.2
8.8
8.5
6.3
8.6
10.3
9.8
11.8
13.2
12.1
11.1
9.5
8.3
6.7
6.3
4.9
7.4
8.8
10.8
13.1
12.6
12
11.1
9.7
8.4
7.7
7.2
6.7
7.6
10.2
11.6
13.1
14
13.5
12.4
11.3
9
6.3
6.5
6.4
5.8
10.3
11.3
11.8
13.4
12.2
11.9
11.1
9.3
7.2
6.3
5.5
8.6
10.4
11.6
13.2
13.8
13.4
12.7
11.8
9.2
7.3
7.5
6.3
7
9.6
12.4
12.6
13.2
11.6
11.5
10.6
8.2
6.7
7.3
6.5
7.6
9
10.8
12.7
12.3
12.2
12.2
10.4
7.6
7.7
7.3
5.6
6.2
10.1
11.1
13.5
13
13.4
11.8
9.8
9
5.2
4.7
4.3
6.5
7.7
9.9
10.7
12.1
12
11.7
9.5
6.5
4.4
5.3
5.1
7
9.4
11.9
11.2
13.3
13.2
12.5
11.4
9.5
8.9
6.7
7.1
8.3
10.3
10.3
12.5
13
12.6
12.1
9.9
7.7
8.4
6.9
7.3
8
8.9
13.1
12.5
13.9
13
13.2
10.8
9.4
8.1
4.9
7.3
7.7
7.7
10.1
12.3
12.4
11.8
11.9
10.7
9.1
6.5
8.3
3.7
6.7
8.9
9.4
10.9
11.7
11.4
10.9
9.3
7.6
7.6
4.8
4.7
6.9
8.3
9.1
11.3
11.2
11.5
11.4
9.7
8.7
5.6
6.5
6.4
7.8
9.5
12.3
12.5
12.9
13.3
13.1
11.5
9.8
7.7
8.5
7.1
8.1
8.9
10.9
11.6
12.4
11.6
11.5
9.6
9.1
8.3
6.1
8.7
6.9
8.9
10.4
12.8
13.5
13.1
11.9
10.5
7.7
6.1
6.5
6.7
7.1
8.5
10
12.5
12.5
12.5
10.5
10.7
8.7
7.2
7.2
6.4
9.6
9.2
11.1
12.8
13.1
13.2
12.1
10.4
9.2
6.7
5.1
7.4
8.4
9.8
10.1
11.5
12.3
13.3
11.1
9.7
8.1
7.3
5.9
8
6.7
8.5
10.3
13.3
13.5
12.4
12.7
12.4
10.3
9
7.3
7.1
7
9.1
10.5
11.8
12
12.1
10.4
9.5
7.8
7.6
6.3
5.7
6.9
11.2
11.2
14
15.5
13.7
13.3
12.4
10.4
6.6
7.5
6.7
8.6
9.9
12.3
13.3
12.9
12.6
12.1
11.3
8.9
7.6
5
5.6
7.2
10.7
11
12.5
12.8
12.8
12.7
10.8
8.9
7.8
4.1
5.1
8.2
9.7
9.5
12.2
12.7
12.7
12.2
11
9.8
7.3
5.8
6.3
8.3
10.9
11
12.7
13.5
13.4
11.8
11.5
9.1
6.9
8.2
7.2
7.2
10
10.6
11.8
13.8
12
10.1
8.7
7.5
5.2
5.8
4.5
6
8
10.4
13
12.5
11.7
10.8
9.5
8.3
5.8
5.8
5.1
6.7
10.6
13.7
12.8
13.8
13.8
13.7
12.6
9.8
9.6
7.3
8.3
7
9
10.8
11
12.4
11.5
11.4
10
5.7
6.6
4
4.4
5.5
8.8
11
12.4
12.6
12.1
11
9.6
7.7
6.1
6.4
6.9
6.6
7.8
10.4
11.4
11.7
11.3
10.4
8.9
8
5.5
5.1
5.4
5.6
9.9
12
12.6
14
14.1
12.9
9.9
7.8
6.5
5.9
5.6
8.1
9.3
11.3
13.5
13.6
13.6
12.9
12.3
10
8.1
8.2
8.9
9.5
10.1
9.3
11.1
11.3
11.9
11.6
10.7
9.1
7.4
6
6.9
7.9
9.7
11.2
12.6
11.1
13.3
11.7
11
9.1
8.5
5.9
6.3
7.2
9.7
11.3
12.5
13.2
13.4
12.7
10.7
9.1
7.3
5.1
6.2
9.9
9.9
10.5
11.5
11.8
12.4
11.5
11.1
8.4
7.5
6.3
7
7.5
10.1
11.9
13.9
14.5
14.7
14
12.5
11.1
9.3
9.8
10.3
10.1
10.1
11.7
13.3
14.4
14.1
12.1
10.5
9.7
8.5
7.1
5.3
8.1
10.1
11.1
13.2
13.2
12.2
11.8
11.3
9.3
5.1
7.5
5.4
6.1
7.5
9.4
12.6
13.6
12.4
11.5
10.7
8.4
7.6
4.7
6.9
8.4
9.3
11.6
11
12.8
12
12.2
10.9
9.3
9.7
7.1
7.4
10.7
11.5
12.6
13.1
14.7
14.3
13.5
11.2
8.9
7.8
7.8
6.7
6.8
10.1
10.8
13.9
12.8
12.5
10.6
9.1
7.4
6.5
5.4
6.8
7.3
7.6
10.1
12.8
12.1
13.3
11.7
9.9
8.7
8.9
6.9
10
8.3
9.7
10.3
12.4
12.8
13.5
13.3
10.9
9.1
7.7
6.3
6.5
9.5
9.9
12.6
13.3
13.4
14
13.3
11.1
10.1
8.5
10.1
7.7
10.5
11
11.1
12.5
14.9
12.8
11.2
11.2
9.5
7.3
6.8
6.4
10.1
11.4
12.4
13.9
13.5
15.1
13.4
12
9
7
6.7
6.5
9.4
10.8
12
12.9
14.1
14.9
13.5
11.9
9.8
9.3
7
7.8
7.2
9.6
11.6
13
12.7
13.2
12
10.2
8.8
7.5
5.7
6.2
7.4
9
12.2
12.4
12.5
12.4
10.3
9.7
8.4
5.6
7.3
4.8
8.6
11.9
11.9
14.7
14.3
15.1
14.7
13.4
11.4
8.6
7.8
10.2
10
11.1
11.5
12.1
12.6
12.7