The Pu‘uwa‘awa‘a (PWW) RAWS station is jointly operated by the State and Private Forestry and the National Interagency Fire Center (NIFC) of the Forest Service. Click here to learn more about RAWS. The station is located at an elevation of 2,326 feet (709 m) above sea level and has been in continuous operation since 2004. Besides precipitation, a number of other climatic data is collected by the station. These include, solar radiation, wind speed and direction, wind gust speed, average, minimum, and maximum air temperature and relative humidity, and evapotranspiration.
Data from the station is available from NOAA’s Western Regional Climatic Data Center and can be downloaded here. Average annual precipitation for the site is 28 in (710 mm). Longer term (41 year) precipitation records from the NOAA cooperative PWW station located nearby show similar patterns of precipitation. Normal, 41-year, annual rainfall is about 22 inches (563 mm), slightly drier than the data available from 2004-2007.
The first set of graphs below show the total annual and average monthly precipitation for the PWW RAWS station from 2004-2007. Rainfall can be extremely variable from year to year. These four years at have been a wet period for PWW. 2008 rainfall is running about half normal levels.
The second set of graphs show show average monthly solar radiation, air temperature, and relative humidity (error bars are standard errors). As is expected, the summer months show higher solar radiation and higher average air temperatures. Relative humidity is only slightly lower during the drier summer months.
The downloadable file below contains copies of the graphs, the daily RAWS data files, metadata for the station, and some summary data we have prepared.