Friday Harbor (WA) Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Friday Harbor, Washington State, United States of America. Long-term data from 1990 to 2020 was used to calculate these averages. Let's now guide you through the details for a complete overview.

On average, Friday Harbor receives a reasonable amount of rain/snowfall, with an annual precipitation of 671 mm (26 in). Despite this overall moderate level, the city experiences distinct dry season during certain months throughout the year, as illustrated in the precipitation charts below.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

Significant seasonal changes in precipitation occur throughout the year. During the wettest month, November receives substantial rainfall, averaging 108 mm (4.3 in) of precipitation, recorded across 19 rainy days.

In contrast, the driest month, July brings less rainfall, with 14 mm (0.6 in) over 5 rainy days.

November, the wettest month, has a maximum daytime temperature of 10°C (50°F). The city receives 84 hours of sunshine in this period. During the driest month July you can expect a temperature of 20°C (68°F). For more detailed insights into the city's temperatures, visit our Friday Harbor Temperature page.

Friday Harbor's average annual precipitation is 671 mm (26 in). Let's compare this to some popular worldwide tourist destinations:

New York City, USA, receives 1276 mm (50 in) of rainfall annually, with precipitation evenly distributed throughout the year.

In Shanghai, China, the annual average precipitation is 1347 mm (53 in), with a humid subtropical climate.

In Tokyo, Japan, the average annual precipitation is 1528 mm (60 in), with significant summer rains due to typhoon season.

Mumbai, India, experiences a tropical monsoon climate with 1860 mm (73 in) of annual rainfall, with the majority of precipitation happening during the monsoon season from June to September.

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

• "Ginger" was the longest-lasting Atlantic tropical storm, which spun around the open ocean for 28 days in 1971.
• The world's largest snowflake was recorded in the Guinness Book of Records, at 38 cm (15 inches) wide and 20 cm (7.9 inches) thick. The snowflake fell at Fort Keogh, Montana, USA, on 28 January 1887.
• The greatest snowfall recorded was on Mt. Rainier, Washington State, USA, over 31.5 meters (103 feet) fell during the winter of 1972.

For more detailed information about Friday Harbor (WA)'s weather, including sunshine hours, humidity levels, and temperature data, visit our Friday Harbor (WA) Climate page.