|  |  | CHAPTER 1 GENERAL SURVEY 9 |  |  |  |  |
1－4 Yearly Hydro-Meteorological Data (2009-2010) |
Items | 2010 | 2009 |
|  |  | Temperature:Average Annual Temperature | (oC) | 16.9 | 17.1 |
|  |  | Annual Utmost highest Air Temperature | (oC) | 38.7 | 37.7 |
|  |  | Date It Appeared | (Day/month) | 8--13 | 7--19 |
|  |  | Annual Utmost Lowest Air Temperature | (oC) | -5.6 | -6.5 |
|  |  | Date It Appeared | (Day/month) | 1--14 | 1--24 |
|  |  | Precipitation:Total Annual Precipitation | (mm) | 931.1 | 1280.2 |
|  |  | Annual number of heaviest Precipitation | (day) | 126 | 118 |
|  |  | In one day the Heaviest Precipitation | (mm) | 54.6 | 136.4 |
|  | Date It Appeared | (Day/month) | 7--11 | 6--30 |
|  |  | Sunshine:Annual Sunshine Time | (hour) | 1935.0 | 1846.4 |
|  |  | Annual Sunshine Percentage | (%) | 44 | 42 |
|  |  | Average Annual Relative Humidity | (%) | 70 | 71 |
|  |  | Average Annual Wind-force | (m/second) | 2.7 | 2.7 |
|  |  | Average Annual Atmospheric Pressure | (millibar) | 1016.1 | 1015.9 |
|  |  | Water Level:Peak level | (m) | 4.39 | 4.52 |
|  |  | Date It Happened | (Day/month) | 7--13 | 7--30 |
|  |  | Lowest Water Level | (m) | 3.06 | 2.91 |
|  |  | Date It Happened | (Day/month) | 1--26 | 1--25 |
|  |  | Annual Average Water Level | (m) | 3.59 | 3.48 |
Note: 1. Non-frost Season: 206 Days. |  |
2. Frost Season: The First Day: 11 / 9 /2010, the Final Day: 4 / 16 /2010. |  |
3. Snow Season: The First Day: 12 / 15 /2010, the Final Day：4 / 14 /2010. |  |
4.Water Level is measured at Great Cannel of Wuxi. (Wusong basic level). |  |