how many days a year does it rain in eureka ca
Eureka, California Annual precipitation averages 40.3 inches or 1,024 millimetres. Measurable precipitation falls on an average of 119 days each year. The wettest “rain year” was from July 1889 to June 1890 with 73.30 inches (1,861.8 mm) and the driest from July 1976 to June 1977 with 17.56 inches (446.0 mm). The greatest monthly precipitation was 23.21 inches (589.5 mm) in December 2002. The greatest 24-hour precipitation was 6.79 inches (172.5 mm) on December 27, 2002. However, historic “100” year dramatic weather events such as the Christmas Week flood of 1955 and, especially, the Christmas flood of 1964, which severely damaged the region, may not be reflected in records listed herein. Snowfall on the coast happens occasionally, averaging only 0.2 inches or 0.0051 metres as of the 1981–2010 normals, but only five years during that period received measurable snowfall.[64]
San Francisco fog Under normal summertime conditions, a daily pattern of fog and low clouds occurs. Morning sun heats the ground which in turn heats the marine layer over the land areas. This creates convective turbulence within the marine layer as well as evaporation of any clouds within it. The marine layer clears back toward the coast, usually by noon. By mid-afternoon, inland areas have heated sufficiently to decrease the air pressure and increase the onshore flow. By late afternoon, the wind increases and begins to cool the onshore marine layer, allowing the fog and low clouds offshore to progress inland without evaporating. Cloudiness streams in over the Bay and through the various gaps. How far the clouds can penetrate inland depends on the depth of the marine layer and the strength of the cooling winds. As night falls and inland areas cool down, the winds usually decrease, but the fog and clouds remain wherever they have blown in until the following morning when the cycle repeats.[7]