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coastal fog
Marine climate
South Slough Reserve has a marine climate - mild and humid - resulting from the moderating influences of the Pacific Ocean and from the rainfall induced by the Coast Range. Fog is common in the summer months, so if you are planning a visit to the Reserve, always dress in layers for the weather. Rainfall along the coast averages about 80 inches a year. Rainfall comes throughout the year with January, February, and March averaging about 7.4 inches per month. April, May, and June average 2.7 inches per month. July, August, and September average 1.0 inches per month. And October, November, and December average 7.2 inches per month. Average maximum temperatures for the area are 55 degrees F with a 36 degree F average minimum temperature in January, February, and March. April, May, and June average temperatures are 64 degrees F and 43 degrees F. July, August, and September averages are 71 degrees F with lows of 48 degrees F. October, November, and December averages are 60 degrees F with lows of 38 degrees F. Extreme high or low temperatures are rare. Snowfall is also rare. From March through October, the area is subject to prevailing winds from the northwest, and from November through February, winds come mainly from the southwest. Summer winds are usually heavier in the afternoon hours.