Narrative Summary - July 1999

July 1999 was cooler than normal, averaging 73.8ºF, 2.4º below normal (76.2ºF). This
was the 4th consecutive month with a below normal average temperature following a period
(August 1997 through March 1999) when the monthly average temperature was above
normal for 19 out of 20 months. The warmest July occurred in 1985 and averaged 82.2ºF,
while the coolest was 70.5ºF in 1993. Through July there have been 24 days with
maximum temperatures => 90ºF compared to a normal of 30 days, and 5 days with
maximum temperatures => 100ºF compared to a normal of 8 days. The following daily
temperature records were established in July:

                          New          Old
Date   Category          Record       Record     Year
  3    Low Minimum         45		46	 1990     
  5    Low Minimum	   47		47	 1980  Tie
 26    Low Minimum         53		54	 1948

Precipitation for July 1999 totaled 0.07 in., 39% of normal (0.18 in.). The wettest July, in
1993, received 1.76 in., while the driest, in 1980 and earlier years, received only a trace.
Total precipitation since January 1 was 2.37 in., 71% of normal (3.36 in.).

The average wind speed for July 1999 was 9.4 miles per hour (mph), 0.6 mph above
normal (8.8 mph). The windiest July on record averaged 10.7 mph (1983), while the July
with the lightest winds (1955) averaged 6.8 mph. The peak gust for the month was 44
mph on July 24. The record wind gust for July was 69 mph in 1979.

The monthly climatological data summaries, as well as other information, are available
on the Internet. Address: http://etd.pnl.gov:2080/HMS/. Hanford Site personnel can
access the HMS Intranet site at: http://hms.rl.gov/

For additional information contact:
Ken Burk373-3215
Dana Hoitink372-6414

Note: The information in this summary pertains specifically to
the Hanford Meteorology Station (HMS), which is located
approximately 25 miles northwest of Richland, Washington. No
attempt should be made to infer meteorological conditions at other
locations from these data.