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Elevation: 12 feet     Latitude: 48 47N     Longitude: 122 29W
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 Lummi Island is 49.4°F (9.7°C). The warmest month, on average, is July with an average temperature of 61.4°F (16.3°C). The coolest month on average is January, with an average temperature of 36.9°F (2.7°C).

The highest recorded temperature in Lummi Island is 97.0°F (36.1°C), which was recorded in June. The lowest recorded temperature in Lummi Island is -4.0°F (-20°C), which was recorded in January.

The average amount of precipitation for the year in Lummi Island is 35.4" (899.2 mm). The month with the most precipitation on average is December with 5.1" (129.5 mm) of precipitation. The month with the least precipitation on average is July with an average of 1.1" (27.9 mm). There are an average of 157.0 days of precipitation, with the most precipitation occurring in December with 20.0 days and the least precipitation occurring in July with 6.0 days.

In Lummi Island, there's an average of 11.2" of snow (0 cm). The month with the most snow is January, with 4.6" of snow (11.7 cm).

Koppen Chart