Weather at Doug & Joan's House

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Today's Weather Conditions at Doug & Joan's House Location: Livermore, California USA Station ID: KCALIVER9 Report Generated: 07/24/08 11:03p.m. [The ticker message, graphs & camera image are updated every 10 minutes.]


Currently 61.7F Max High: 110.8F on 07/22/2006 (since 1996) Min Low: 23.9F on 12/24/98 (since 1996)		Currently: 29.893 inches and Steady


Wind Speed: 0.0 mph Wind Direction: WSW		Max Wind Speed: 53.0 mph on 02/25/04 Hi Wind Speed: 36.0 mph on 02/02/08 7:54p.m.


Current Humidity:73%		Current Wind Direction: WSW


Rainfall Today: 0.00 inches		Season Total Rainfall (July to June): 12.36 inches Average Annual Rainfall 1997-2007: 15.1 inches

Historical Weather Conditions for the Livermore Valley, California

[Information extracted from the Environmental Impact Report for the Lawrence Livermore National Laboratory 1992] http://www.globalsecurity.org/wmd/library/report/enviro/eis-0157/eis0157_47.html

Temperature

The mean annual temperature for the 30-year period from 1951 through 1980 was 14.5 degrees C (58.1 degrees F) with daily extremes ranging from 7.8 degrees C (18 degrees F) to 45 degrees C (113 degrees F). Daily maximum and minimum temperatures for each month for Livermore, California, are shown in table 4.7-1 of the report.

Precipitation

Most rainfall in the Livermore Valley occurs between October and April. The average annual precipitation for the valley is 14.9 inches (NOAA, 1980 to 1990). Table 4.7-2 in the report contains the average monthly precipitation for the Livermore Valley for the years 1980 through 1990.

Winds

The Livermore Valley is bowl-shaped, measuring approximately 21 km in length and 7 to 11 km in width. The surrounding hills range from 300 to 600 m above the valley floor. As airflow moves east through Dublin Gap, it diverges until it encounters Mt. Diablo and the Altamont Hills to the north. These obstructions turn the flow toward the southeast. South of the Dublin Gap, the influence of the foothills of the Diablo Mountain Range and the surrounding Altamont Hills then diverts the airflow towards the northeast. Airflow exits the valley through Altamont Pass. Large-scale upper-air influences either weaken or enhance this surface flow pattern.

During the summer months, winds are predominantly from the south or southwest as a result of the sea breeze. The sea breeze phenomenon is created when air over land is heated more rapidly by solar radiation than the air over the cooler Pacific Ocean. As the air is heated it rises and begins to develop a circulation, causing the air over the ocean to move inland. During this period of replacement (which typically occurs between 14:00 and 16:00 Pacific Standard Time), the wind velocity increases. This differential heating rarely occurs during the winter months when winds are more even