Full Climatology For St Helens
Long Term Averages
| JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANNUAL | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean Max (°C) | 22.9 | 22.2 | 21.1 | 18.6 | 16.2 | 14.1 | 13.6 | 14.4 | 16.1 | 17.6 | 19.5 | 21.3 | 18.1 |
| Mean Min (°C) | 13.6 | 13.4 | 12.0 | 9.8 | 7.3 | 5.5 | 4.9 | 5.4 | 6.7 | 8.2 | 10.3 | 11.8 | 9.0 |
| Mean Rain (mm) | 64.6 | 62.0 | 63.6 | 50.5 | 48.2 | 66.8 | 45.0 | 54.9 | 51.8 | 68.9 | 78.0 | 61.3 | 723.8 |
| Rain Days | 8.0 | 10.0 | 9.0 | 12.0 | 14.0 | 17.0 | 17.0 | 15.0 | 12.0 | 12.0 | 11.0 | 10.0 | 150.0 |
Daily Records
| JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANNUAL | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High Max (°C) | 41.8 | 35.6 | 34.4 | 28.4 | 24.1 | 19.2 | 19.3 | 20.9 | 25.2 | 29.7 | 33.8 | 36.8 | 41.8 |
| Low Max (°C) | 15.6 | 13.9 | 11.9 | 10.8 | 9.8 | 9.2 | 9.0 | 8.8 | 10.2 | 11.1 | 11.1 | 13.6 | 8.8 |
| High Min (°C) | 21.2 | 21.0 | 20.7 | 17.5 | 15.9 | 15.3 | 12.8 | 12.5 | 14.2 | 17.2 | 18.2 | 20.0 | 21.2 |
| Low Min (°C) | 4.8 | 6.3 | 3.1 | 1.3 | 0.0 | -1.0 | -0.9 | -1.0 | -0.3 | 0.9 | 1.9 | 4.3 | -1.0 |
| High Rain (mm) | 148.0 | 84.6 | 112.0 | 184.0 | 104.0 | 83.6 | 41.0 | 64.0 | 82.4 | 67.2 | 121.0 | 99.2 | 184.0 |
Monthly Records
| JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANNUAL | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High Mean Max (°C) | 25.8 | 24.3 | 22.9 | 20.4 | 17.9 | 15.2 | 14.9 | 15.7 | 17.7 | 19.5 | 21.0 | 23.1 | 18.7 |
| Low Mean Max (°C) | 20.4 | 20.1 | 19.8 | 16.4 | 14.5 | 12.7 | 12.7 | 12.9 | 14.5 | 15.3 | 17.6 | 18.6 | 17.3 |
| High Mean Min (°C) | 15.0 | 15.5 | 13.6 | 11.4 | 9.6 | 7.0 | 7.0 | 7.8 | 8.0 | 9.4 | 11.8 | 13.4 | 9.6 |
| Low Mean Min (°C) | 11.8 | 12.0 | 10.5 | 7.4 | 5.9 | 3.2 | 3.0 | 3.7 | 4.8 | 6.2 | 8.5 | 9.8 | 8.1 |
| High Rain (mm) | 238.4 | 200.6 | 173.4 | 229.2 | 179.0 | 180.2 | 82.2 | 184.8 | 122.4 | 234.4 | 291.4 | 169.2 | 1214.4 |
| Low Rain (mm) | 0.2 | 9.6 | 13.0 | 16.4 | 6.4 | 2.0 | 9.6 | 2.6 | 5.2 | 9.4 | 13.2 | 3.8 | 363.4 |
Average Number of Days with Temperatures
| JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANNUAL | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ≥ 40.0°C | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| ≥ 35.0°C | 0.4 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 |
| ≥ 30.0°C | 1.6 | 1.0 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 0.5 | 3.8 |
| ≤ 2.0°C | 0.0 | 0.0 | 0.0 | 0.1 | 1.0 | 4.0 | 5.4 | 4.8 | 1.8 | 0.4 | 0.0 | 0.0 | 17.7 |
| ≤ 0.0°C | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.4 | 0.6 | 0.6 | 0.1 | 0.0 | 0.0 | 0.0 | 1.8 |