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Elevation: 90 meters     Latitude: 51 09N     Longitude: 001 34W
Köppen Classification: Marine West Coast Climate



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 is 50.5°F (10.3°C). The warmest month, on average, is July with an average temperature of 62.8°F (17.1°C). The coolest month on average is January, with an average temperature of 40.1°F (4.5°C).

The highest recorded temperature in Winchester is 95.0°F (35°C), which was recorded in August. The lowest recorded temperature in Winchester is 15.8°F (-9°C), which was recorded in February.

The average amount of precipitation for the year in Winchester is 32.4" (823 mm). The month with the most precipitation on average is December with 4.0" (101.6 mm) of precipitation. The month with the least precipitation on average is May with an average of 2.0" (50.8 mm). There are an average of 201.0 days of precipitation, with the most precipitation occurring in January with 20.0 days and the least precipitation occurring in August with 14.0 days.

In terms of liquid precipitation, there are an average of 85.4 days of rain, with the most rain occurring in December with 9.8 days of rain, and the least rain occurring in September with 5.8 days of rain.

Koppen Chart