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The city of Seattle has a temperate maritime oceanic climate characterized by relatively hot and dry summers and by rainy and not excessively cold winters. Spring and autumn are also quite rainy but generally have mild temperatures. The mountains and bodies of water that surround the city influence the climate of Seattle making it relatively mild. Annual temperatures are therefore mild throughout the year and the average values of minimum temperatures never drop below zero. Even the maximum average temperatures record mild values. In summer, they never exceed 25 ° C on average. Seattle has an average annual temperature of 11.4 ° C. Furthermore, it varies between 18.9 ° C in August and 4.8 ° C in December.
The rains fall mainly between November and March. The month with the most rainfall is in fact that of November which has an average of 167 mm of rain distributed over 18.4 days. The annual average rainfall in Seattle is therefore 952 mm. Precipitation is spread over an average of 152 rainy days per year. The driest month is therefore July with an average of only 18 mm of rainfall spread over just 5 days. Seattle has an average of 2,170 hours of sunshine per year. The month with the most sunshine is still July with an average of 312 hours of sunshine. Seattle has an average of around 200 cloudy days per year.
In the city of Seattle snow can fall between November and March, but heavy snowfalls are rare and snow is not abundant, the city has an average of about 17 cm of snow per year, distributed over 4.6 days of snow per year.
WHEN TO GO TO SEATTLE
The best months for a trip to Seattle are the brightest, driest and hottest months from May to September.
THE CLIMATE OF SEATTLE: CLIMATIC TABLES
| SEATTLE (132 meters) | ||||
| Month | Average low (°C) | Average high (°C) | Precip. (mm) | Precip. days (snow days) |
| January | 2,7 | 8,4 | 141,5 | 18,2 (1,3) |
| February | 2,7 | 9,9 | 88,9 | 14,7 (0,9) |
| March | 4,1 | 12,1 | 94,5 | 16,9 (0,5) |
| April | 5,7 | 14,7 | 68,8 | 14,3 |
| May | 8,5 | 18,2 | 49,3 | 12,0 |
| June | 11,1 | 21,1 | 39,9 | 9,1 |
| July | 13,1 | 24,3 | 17,8 | 5,0 |
| August | 13,3 | 24,6 | 22,4 | 4,8 |
| September | 11,2 | 21,4 | 38,1 | 7,9 |
| October | 7,7 | 15,4 | 88,4 | 13,1 |
| November | 4,4 | 10,5 | 166,9 | 18,4 (0,3) |
| December | 2,0 | 7,6 | 135,9 | 17,6 (1,6) |
| YEAR | 7,2 | 15,7 | 952,2 | 152,0 (4,6) |
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