Oct. 2004
- Sep. 2005
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Wetlands
Monitoring System Weather Water Quality Wildlife |
Water Quality & Research Weather at the Preserve - Rainfall
Background InformationHow to Interpret the Rainfall DataThe rainfall graphs above and the hourly data show the accumulative amount of rainfall for each day starting at midnight. Rainfall is shown in inches. At the start of each day (at midnight), the rainfall is zero. The amount of rainfall is incrementally added during the day and reaches its daily total at midnight. At midnight for each day, the data show a drop from the previous day's total rainfall to zero. The Water YearThe water year goes from October 1 through September 30 of the following year. It starts with the autumn months, goes through our rainy season and then through the relatively dry summer months. Rainfall and other weather data have been recorded at the Preserve since 2002, when our weather station (Capricorn 2000, manufactured by Columbia Weather Systems) was deployed. The first full water year of data is 2003, which covers Oct. 1, 2002 to Sep. 30, 2003. Rainfall Totals for Water Years at Jackson BottomThe rainfall at the Preserve differs from that at the Hillsboro Airport or in Portland. This is an example of microclimates - how climate varies within a geographical region. The following chart shows the monthly rainfall totals during the water year. The chart compares the water year ending Sep. 2006 with the average of the four water years between Oct. 2002 and Sep. 2006. Notice the rainfall that we received during Dec. 2005 and Jan. 2006 when Jackson Bottom was flooded. (See also Flooding at the Preserve.) The following charts show how the rainfall has varied during the wet and dry seasons. Notice how dry the summer of 2006 was.
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