|  | CHAPTER 1 GENERAL SURVEY 9 |
1－4 Yearly Hydro-Meteorological Data（2008－2009） |
Items | 2009 | 2008 |
Temperature:Average Annual Temperature | (oC) | 17.1 | 16.8 |
Annual Utmost highest Air Temperature | (oC) | 37.7 | 38.5 |
Date It Appeared | (Day/month) | 2010-7-19 | 2009-7-6 |
Annual Utmost Lowest Air Temperature | (oC) | -6.5 | -5.8 |
Date It Appeared | (Day/month) | 2010-1-24 | 1-31 12-22 |
Precipitation:Total Annual Precipitation | (mm) | 1280.2 | 1083.1 |
Annual number of heaviest Precipitation | (day) | 118 | 125 |
In one day the Heaviest Precipitation | (mm) | 136.4 | 65.2 |
Date It Appeared | (Day/month) | 2010-6-30 | 2009-6-18 |
Sunshine:Annual Sunshine Time | (hour) | 1846.4 | 1845.7 |
Annual Sunshine Percentage | (%) | 42 | 42 |
Average Annual Relative Humidity | (%) | 71 | 70 |
Average Annual Wind-force | (m/second) | 2.7 | 2.6 |
Average Annual Atmospheric Pressure | (millibar) | 1015.9 | 1016.3 |
Water Level:Peak level | (m) | 4.52 | 4.11 |
Date It Happened | (Day/month) | 2010-7-30 | 2009-6-18 |
Lowest Water Level | (m) | 2.91 | 3.08 |
Date It Happened | (Day/month) | 2010-1-25 | 2009-12-26 |
Annual Average Water Level | (m) | 3.48 | 3.51 |
Note: 1. Non-frost Season: 229 Days. |
2. Frost Season: The First Day: 11 / 18 /2009, the Final Day: 4/ 2 /2009. |
3. Snow Season: The First Day: 11 / 17 /2009, the Final Day：2 / 27 /2009. |
4.Water Level is measured at Great Cannel of Wuxi. (Wusong basic level). |