| Jan | Feb | March | April | May | June | July | Aug | Sept | Oct | Nov | Dec |
|---|
| 1 | 20.9 | 27.9 | 24.2 | 21.2 | 13.6 | | | | | | | |
|---|
| 2 | 20.9 | 20.6 | 19.6 | 19.4 | 12.5 | | | | | | | |
|---|
| 3 | 19.3 | 21.3 | 20.2 | 20.6 | 14.6 | | | | | | | |
|---|
| 4 | 27.7 | 22.4 | 17.6 | 17.3 | 15.5 | | | | | | | |
|---|
| 5 | 29.8 | 21.6 | 19.9 | 21.2 | 16.1 | | | | | | | |
|---|
| 6 | 27.9 | 20.6 | 23.0 | 20.0 | 15.3 | | | | | | | |
|---|
| 7 | 24.6 | 21.5 | 21.6 | 19.9 | 19.5 | | | | | | | |
|---|
| 8 | 22.6 | 21.9 | 18.0 | 19.4 | 22.8 | | | | | | | |
|---|
| 9 | 27.3 | 24.8 | 18.8 | 22.8 | 17.7 | | | | | | | |
|---|
| 10 | 28.9 | 26.1 | 21.5 | 23.7 | 19.8 | | | | | | | |
|---|
| 11 | 28.3 | 18.9 | 26.4 | 24.3 | 14.1 | | | | | | | |
|---|
| 12 | 30.4 | 20.4 | 21.5 | 21.0 | 19.5 | | | | | | | |
|---|
| 13 | 26.5 | 21.7 | 19.5 | 23.3 | 19.7 | | | | | | | |
|---|
| 14 | 26.4 | 25.5 | 23.5 | 17.5 | 21.1 | | | | | | | |
|---|
| 15 | 27.1 | 21.8 | 25.9 | 20.9 | 18.1 | | | | | | | |
|---|
| 16 | 24.2 | 20.6 | 20.2 | 22.0 | 18.8 | | | | | | | |
|---|
| 17 | 21.2 | 23.4 | 23.8 | 22.2 | 16.6 | | | | | | | |
|---|
| 18 | 27.8 | 28.9 | 25.6 | 15.3 | | | | | | | | |
|---|
| 19 | 27.3 | 22.7 | 16.0 | 17.7 | | | | | | | | |
|---|
| 20 | 29.7 | 23.0 | 17.9 | 17.5 | | | | | | | | |
|---|
| 21 | 24.3 | 28.0 | 21.5 | 21.9 | | | | | | | | |
|---|
| 22 | 25.8 | 21.4 | 26.3 | 21.5 | | | | | | | | |
|---|
| 23 | 17.9 | 27.7 | 28.1 | 22.6 | | | | | | | | |
|---|
| 24 | 20.7 | 27.0 | 29.4 | 22.8 | | | | | | | | |
|---|
| 25 | 21.0 | 19.4 | 28.4 | 22.5 | | | | | | | | |
|---|
| 26 | 29.1 | 20.9 | 20.4 | 25.0 | | | | | | | | |
|---|
| 27 | 20.2 | 18.6 | 23.2 | 24.5 | | | | | | | | |
|---|
| 28 | 24.7 | 20.3 | 21.4 | 22.8 | | | | | | | | |
|---|
| 29 | 26.9 | 24.2 | 17.8 | 21.3 | | | | | | | | |
|---|
| 30 | 27.1 | | 17.0 | 22.2 | | | | | | | | |
|---|
| 31 | 27.8 | | 22.6 | | | | | | | | | |
|---|
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