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This area is characterized by equable climates with few extremes of temperature and ample precipitation in all months. It is located poleward of the Mediterranean climate region on the western sides of the continents, between 35° and 60° N and S latitude. Unlike their equatorial neighbors, marine west coast climates are located beyond the farthest poleward extent of the subtropical anticyclone, and they experience the mid-latitude westerlies and traveling frontal cyclones all year. Precipitation totals vary somewhat throughout the year in response to the changing location and intensity of these storm systems, but annual accumulations generally range from 500 to 2500mm (20 to 98 inches), with local totals exceeding 5000mm (197 inches) where onshore winds encounter mountain ranges. Not only is precipitation plentiful but it is also reliable and frequent. Many areas have rainfall more than 150 days per year, although the precipitation is often of low intensity. Fog is common in autumn and winter, but thunderstorms are infrequent. Strong gales with high winds may be encountered in winter. Temperatures in the winter tend to be mild, while summer temperatures are moderate.
The Köppen Climate Classification subtype for this climate is "Cfb". (Marine West Coast Climate).
The average temperature for the year in Winchester Lake State Park is 44.2°F (6.8°C). The warmest month, on average, is August with an average temperature of 62.6°F (17°C). The coolest month on average is December, with an average temperature of 27.7°F (-2.4°C).
The highest recorded temperature in Winchester Lake State Park is 98.2°F (36.8°C), which was recorded in July. The lowest recorded temperature in Winchester Lake State Park is 4.5°F (-15.3°C), which was recorded in December.
The average amount of precipitation for the year in Winchester Lake State Park is 22.5" (571.5 mm). The month with the most precipitation on average is May with 3.0" (76.2 mm) of precipitation. The month with the least precipitation on average is August with an average of 1.0" (25.4 mm). There are an average of 141.7 days of precipitation, with the most precipitation occurring in November with 15.6 days and the least precipitation occurring in August with 6.0 days.
In Winchester Lake State Park, there's an average of 82.1" of snow (0 cm). The month with the most snow is January, with 17.0" of snow (43.2 cm).