Data set: Pacific Northwest precipitation data 1966-2006
Link to the data set
The full data set in csv format is at:
Background on the data set

This data set gives annual precipitation totals for Portland (OR), Tacoma (WA), and Seattle (WA) for the years 1966-2006, precipitation being defined as: "Any form of water particles-liquid or solid-that falls from the atmosphere and reaches the ground."

Data Source: Western Regional Climate Center (, specifically "Monthly Totals" under "Monthly Precipitation Listings" for the following: Portland, Tacoma, and Seattle. The definition of precipitation quoted above is also from this website, specifically in their climate and weather terms glossary. (All links accessed June 14, 2008.)

Variables in the data set
The variables in the data set are as follows:
year(years)year of precipitation measurement
cityPortland, Seattle, or Tacomalocation of measurement
precipitationinchesamount of annual precipiation
Projects using this data set
39comparing precipitation pairwise in Pacific Northwest cities
23comparing rainfall in Pacific Northwest cities
78comparing the mean annual rainfall in Tacoma and Portland
79confidence interval for the mean difference in annual rainfall between Tacoma and Portland
28regression diagnostics for Pacific Northwest precipitation model
57testing if mean annual rainfalls in three Pacific Northwest cities are all equal