Narrative Summary - September 2007
September 2007 was slightly cooler than normal, averaging 65.8ºF, 0.1º below normal (65.9ºF). The
hottest September (1990) averaged 72.4ºF, while the coolest (1985) averaged 58.8ºF. There were 4 days
in September with maximum temperatures >= 90ºF compared to a normal of 6. There were 58 days this
year with maximum temperatures >= 90ºF compared to a normal of 52 days. The greatest number was 79
days in 1967. There were no days in September with maximum temperatures >= 100ºF compared to a
normal of <1, and a record of 3 on numerous occasions. There were 16 days this year with maximum
temperatures >= 100ºF compared to a normal of 12. The greatest was 28 days in 1958. The following
temperatures records were established during September 2007:
New Old
Date Category Record Record Year
30 Low Maximum 54 63 1954 (and previous years)
Precipitation for September 2007 totaled 0.57 inch, 173% of normal (0.33 inch). The wettest September
(1947) received 1.34 inches, while the driest (1991 and 1999) received no precipitation. Total
precipitation for 2007 (through September) is 3.61 inches, 82% of normal (4.40 inches).
The average wind speed for September 2007 was 8.5 miles per hour (mph), which was 1.2 mph above
normal (7.3 mph). The windiest September (1961) averaged 9.2 mph, while the September with the
lightest winds (1957) averaged 5.4 mph. The peak gust for September 2007 was 41 mph on September
28. 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 Burk | 373-3215 | |
| HMS Staff | 373-2716 |
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.