Climatography of the Hanford Area.

Hanford Site Climatological Data Summary 1998

“…Monthly and Annual Average Temperatures ("F) Year JaD Feb .-19451946194719481949195019511952195319541955195619571958195919601961196219631964196519661%7 1%8 1%9 1970197119721973197419751976197719781979198019811982198319841985198619881990199119921993199419961997 Average Normal …”

“…Weather Bureau recorded some weather, dew point temperature, relative humidity, precipitation, atmospheric pressure, cloud cover, visibility, and solar radiation. Several climatological summaries of data collected at the HMS, at the Old Hanford Townsite, and Richkmd monitoring locations were published over the past 30 years (Jenne and Kerns 1959;Stone et al 1972Stone et al , 1983Hoitink and Burk 1994, 1996,1997). …”

Hanford Site National Environmental Policy Act (NEPA) Characterization

“…Occasionally, there are extended periods of poor dispersion conditions associated with stagnant air in stationary high--pressuresystems that occur primarily during the titer months (Stone et al 1983). Stone et al (1972) estimated the probability of extended periods of poor dispersion conditions. The probability of an inversion, once established, persisting more than 12 hours varies horn a low of about 10°/0in May and June to a high of about 64°/0in September and 4.9…”

Climatological data summary 1994, with historical data

“…These parameters a r e collected hourly, and a r e averaged on a 196919581968197219771971197419571970197319711972MAY 1977 1976(a) 19761979197419621992197219931957197419691973DEC 1973 (a) Most recent o f multiple occurrences.…”