| Jan | Feb | March | April | May | June | July | Aug | Sept | Oct | Nov | Dec |
|---|
| 1 | 22.9 | 20.2 | | | | | | | | | | |
|---|
| 2 | 21.4 | 24.3 | | | | | | | | | | |
|---|
| 3 | 16.3 | 24.3 | | | | | | | | | | |
|---|
| 4 | 16.4 | 17.6 | | | | | | | | | | |
|---|
| 5 | 17.8 | 17.6 | | | | | | | | | | |
|---|
| 6 | 20.9 | 18.7 | | | | | | | | | | |
|---|
| 7 | 22.3 | 20.9 | | | | | | | | | | |
|---|
| 8 | 20.2 | 20.7 | | | | | | | | | | |
|---|
| 9 | 23.8 | 20.6 | | | | | | | | | | |
|---|
| 10 | 23.7 | 21.6 | | | | | | | | | | |
|---|
| 11 | 27.8 | 20.6 | | | | | | | | | | |
|---|
| 12 | 21.1 | 20.7 | | | | | | | | | | |
|---|
| 13 | 22.0 | 23.6 | | | | | | | | | | |
|---|
| 14 | 23.3 | 19.0 | | | | | | | | | | |
|---|
| 15 | 20.7 | 14.8 | | | | | | | | | | |
|---|
| 16 | 23.0 | 17.5 | | | | | | | | | | |
|---|
| 17 | 17.0 | | | | | | | | | | | |
|---|
| 18 | 15.1 | | | | | | | | | | | |
|---|
| 19 | 17.5 | | | | | | | | | | | |
|---|
| 20 | 17.2 | | | | | | | | | | | |
|---|
| 21 | 15.9 | | | | | | | | | | | |
|---|
| 22 | 21.7 | | | | | | | | | | | |
|---|
| 23 | 23.3 | | | | | | | | | | | |
|---|
| 24 | 19.1 | | | | | | | | | | | |
|---|
| 25 | 20.3 | | | | | | | | | | | |
|---|
| 26 | 20.3 | | | | | | | | | | | |
|---|
| 27 | 18.7 | | | | | | | | | | | |
|---|
| 28 | 20.0 | | | | | | | | | | | |
|---|
| 29 | 22.1 | | | | | | | | | | | |
|---|
| 30 | 20.2 | | | | | | | | | | | |
|---|
| 31 | 22.6 | | | | | | | | | | | |
|---|
|
