Narrative Summary - May 2007

May 2007 was slightly warmer than normal, averaging 63.1ºF, 1.3º above normal (61.8ºF). The
warmest May (1947) averaged 68.7ºF, while the coolest (1984) averaged 56.0ºF. No records were
established during May 2007:

Precipitation for May 2007 totaled 0.30 inch, 55% of normal (0.55 inch). The wettest May (1972)
received 2.03 inches, while the driest (1992 and earlier years) received only a trace. Total precipitation
for 2007 (through May) is 2.20 inches, 71% of normal (3.12 inches).

The average wind speed for May 2007 was 9.0 miles per hour (mph), which was 0.1 mph above normal
(8.9 mph). The windiest May (1983) averaged 10.7 mph, while the May with the lightest winds (1957)
averaged 5.8 mph. The peak gust for May was 44 mph on May 21. The record wind gust for May was 71
mph in 1948.

The spring season (March, April and May) was cooler than normal, averaging 54.3ºF, 0.5º above normal
(53.8ºF). The warmest spring (1992) averaged 58.2ºF, while the coolest spring (1955) averaged 48.0ºF.
Spring season precipitation totaled 1.30 inches, 82% of normal (1.58 inches). The wettest spring (1995)
received 3.28 inches, while the driest (1968) received only 0.09 inch.

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
HMS Staff373-2716

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.