Narrative Summary - September 2005

The average temperature for September 2005 was slightly cooler than normal, averaging 65.1ºF, 0.8º below
normal (65.9ºF). The warmest September (1990) averaged 72.4ºF; while the coolest (1985) averaged 58.8ºF.
There were 3 days during September with maximum temperatures => 90ºF compared to a September normal of 6
days, and a record high of 12 in 1998 and earlier years. The total number of days during calendar year 2005
with maximum temperatures >= 90ºF was 56 (normal: 52 days; maximum: 79 days in 1967; minimum: 29 days in
1980). There were 16 days during calendar year 2005 with maximum temperatures => 100ºF (normal: 12 days;
maximum: 28 days in 1958; minimum: 1 day in 1954). No daily temperature records were established in
September 2005.




Precipitation for September 2005 totaled 0.66 inch, 200% of normal (0.33 inch).  The wettest September (1947) 

received 1.34 inches; and the driest (1999 and earlier years) received no precipitation.   Rainfall on September 

30 totaled 0.64 inch, a record for any September 30.  The greatest 24-hr precipitation total for September was 

0.82 inch on September 16-17, 1947.  Total precipitation for 2005 (through September) is 3.20 inches, 73% of 

normal (4.40 inches).



The average wind speed for September 2005 was 7.4 miles per hour (mph), which was near normal (7.3 mph).  

The windiest September on record (1961) averaged 9.2 mph, while the September with the lightest winds 

(1957) averaged 5.4 mph. The peak gust for September 2005 was 44 mph on September 29.  The record wind 

gust for September was 65 mph in 1953.



The monthly climatological data summaries, as well as other information, are available on the Internet.  

Address:  http://hms.pnl.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.